Hello everyone and welcome, I am super excited about this video
We're taking the stock exhaust out of my car as you can see it's out of the car
And we're replacing it with this
This is a titanium exhaust and the reason why I'm so excited is because this video is going to be packed with
Numbers test data, and so we are going to be you know determining
What's the weight difference between these two? What's the sound difference between these two the actual decibel levels at different rpm?
What's the horsepower difference between these two we're going to be putting it on a dyno and of course real world testing.
What is the actual difference in acceleration before and after putting this titanium exhaust on now first off a big
Thank you to AutoTempest.com
this is the final video of a three part series where I've partnered with AutoTempest.com I'll include a link in the video
Description it's a super cool website combines all the different used-car result websites into one website
So you can just search in one location again
I'll have that link in the video description
And thank you to AutoTempest for supporting this channel now this
Exhaust in front of me is what I would consider the holy grail of exhausts for Honda s2000s
This is the amuse euro s. It's a single muffler version. I went with a very similar style to the stock exhaust
Reason being is I didn't want it to be too loud
I think you know four cylinders aren't the greatest
Sounding engines in the world they don't need to be accentuated any more than they are so I wanted something that was still decently quiet
But significantly lighter and this entire thing this entire catback is made out of titanium. It is a
beautiful handcrafted
Hand-built custom order basically when you put in the order is when they start making it
They don't just crank these things out each one is made individually for each customer very beautiful piece of work
Which I ordered from bulletproof automotive. I mean just look at these welds. How clean of a job they did with this it's absolutely
Beautiful and it's titanium the whole thing is titanium so super lightweight now
This is actually the same size diameter as the stock exhaust coming out of the catalytic converter
60 millimeters and the reason why I didn't go any larger honestly, I don't think the catback is what's the restriction within the exhaust.
That's really going to come down to your catalytic converter
I don't plan on removing the catalytic converter
So I don't think it's really going to be necessary to upgrade behind the catalytic converter
I think exhaust flow will be fine does that mean it can't make a power difference?
No absolutely not so this has a much simpler routing less bends in it one single
Simple path rather than that splitting path and the more complicated routing within the muffler's
So we'll see I'm looking forward to the testing to see if there's actually a difference in power between the two so our first
Question what is the weight difference between the two well I've weighed the stock exhaust it came in exactly at 50 pounds
50 pounds for just a catback exhaust
Then I weighed this titanium exhaust full titanium catback
15.8 lbs! 34.2 lbs saved pretty incredible that this exhaust right here is
One-third the weight of the stock exhaust a little under a third of the weight of the stock exhaust even someone as scrawny as myself
Can move this thing around quickly look how lightweight this thing is it's absolutely incredible
All right, so let's get started with the installation, and this is a pretty simple straightforward process
We're gonna go through this fairly quickly first off
we're going to soak down the three exhaust nuts which we're going to need to remove and
Also, spray some oil on the exhaust hangers because these can often be stubborn to remove as well
Next we need to remove the suspension stiffener
There are six bolts that need to be removed to pull this off so that you can drop the exhaust out
Now we can start with the exhaust removal first starting with the three catback nuts
remove these
Using a breaker bar if you need to as they do tend to rust and then pull the exhaust off the bolts and let it
rest in place from here
I work my way back removing the exhaust hangers along the way there are five in total
starting with the one underneath
Then there are two in each wheel well and it can be helpful to remove your wheels to give yourself better
Access now when these hangers are removed the exhaust is quite
Heavy and will drop quickly so to prevent damage have some towels under it or as you see here?
I'm simply dropping it on to some old tires now
I decided to use new mounts since the ones on the car are 15 years old
But honestly they seem to be in great shape and I wouldn't be concerned about reusing them in their current state
there are
Different hardnesses used for these mounts so if you do end up replacing them be sure to buy the correct part numbers
Which I'll have more info on in the video description
installing the new exhaust is as simple as reversing your instructions place each of the rubber mounts on their respective hangers and
slide the exhaust into place
Then mate up the exhaust to the catalytic converter bolts and torque the replacement nuts to 25 pound feet or 33 Newton meters
Finally we can replace the suspension stiffener
torquing the for larger bolts to 33 pound feet or 45 Newton meters and the two smaller screws to 7.2 pound-feet or
or 9.8 Newton meters now at this point you'll notice there's an extra exhaust hanger
And I myself was a bit frustrated because I wasn't sure why it's welded on
But it turns out there was a piece sitting in the shipping box that I didn't notice
this bracket can be mounted with the rear differential mounts and adds an extra mount to make sure the exhaust doesn't contact anything nearby I
Will say at this point if I had ordered the larger 70 millimeter pipe
Clearance may have been an issue as there were a few spots where the exhaust was very close to metal on metal contact
That said with all the mounts on it was very snug in place and now that we're finished with the install it's time for its
Very first start up with the new catback
All right
So the install was a success and startup was the success always a good idea to check under the car make sure you don't have
An exhaust leak on that mating surface between the catalytic converter and the catback where you put in that gasket and now it is time
To move on to sound testing so for sound testing I have this device right here
This is an X Tech stl 600 measures and records decibel level
So I'm placing it in the center because I want to have that in between the two exhaust pipes
And then the same distance from just the single exhaust pipe, so it's the exact same location
For both test measured exactly where I place this and we're going to look at decibel readings at idle at 3,000 rpm
5,000 7,000 and then just giving it some full throttle blips and seeing what the peak?
Volume that it reads so for the stock exhaust was about 64 decibels at idle this is about 900 950
rpm somewhere in that range so 64 decibels at 3,000 rpm
75 decibels about 5,000 rpm about 87 decibels and
7000 rpm we're looking about 95 decibels
Get some full throttle blips how to see what it would say and it looks like the peak measurements were about
122 decibels and now we can listen in on the titanium catback testing
So at idle we're looking at about 68 decibels a little bit louder than idle for the stock exhaust
As you can see a 3000rpm were floating around at 77 decibels
At 5,000 rpm we're looking at about 88 decibels
As we get to 7000rpm, we're looking at about 94, which is very close to the stock, but just slightly quieter
And finally with some full throttle application you can see it peaking at about 122 decibels and
Now we'll listen a quick comparison between full throttle applications with the stock exhaust versus full throttle with the catback exhaust
Okay, so there you have it as far as the sound comparison
honestly
Not a huge difference a little bit of a deeper tone
With the titanium catback not a big difference overall which is slightly disappointing, but I'm also glad that it doesn't sound
You know ricey. I guess is the best word to say it doesn't sound like it doesn't belong on this car
It sounds very close to stock. It's just slightly more aggressive
I think it could be a little bit more
But I'm happy that it's not way too loud
And not super raspy or kind of whiny or rattley like some of the exhausts that you see out there
especially on smaller
Four-cylinder Honda engines now cool to look at is actually plotting these decibel levels
With respect to time so on the left hand side the access we have decibel on the bottom
We have time in blue is stock exhaust and in green is the catback and you know you can see initially
Idling and there's some peaks in there from wind and for me walking past things like that
then you can see the range where it's idling and you can see the catback in green is a
little bit louder now
You know I didn't actually perform these tests with the intent of comparing them side by side with respect to time
But it does turn out that they're a pretty close overlap, so it is fairly easy to look at them
You can see then as it goes up to 3000 rpm
5,000 rpm and then finally
7000 rpm they do stay fairly equal and then looking at you know kind of flooring it and just having those throttle Peaks
The green one seems to have some louder spikes in there
But overall you know they're both peak around 120 decibels alright
So next we have dyno testing moment of truth does this exhaust actually make any more power
Okay, so here's where it's gonna get really ugly in the comments and that's fine
I'm okay with it, but basically what happened is before 183.5 horsepower, after installing 186 horsepower,.
So this is a $2,500 exhaust and it made an additional 2.5 horsepower
$1,000 per horsepower
Probably one of the worst investments you could ever make and I admit that that's true I do
But I am actually really excited about it, and I'm excited about the dyno plot because you can learn from it and honestly
That's why I do these things. I don't do it necessarily because I think it's gonna make my car amazing
I do it mostly because I want to learn now is it lame that it's only two and a half horsepower
Yes, but considering the fact that all that was changed was you took a muffler that goes in once up and then back down
Versus a muffler that goes straight through at the exact same size the fact that you can gain
2.5 horsepower just from that simple change is actually pretty impressive and pretty cool to see
Now why am I confident in the dyno numbers, and how do I know you know?
How do I believe that it's actually 2.5 horsepower increase? Well if you look at the dyno graph,
What's pretty interesting to see is then before VTEC kicks in yo at about
6,000 rpm both of the torque and the horsepower lines are basically identical
Before and after flow isn't super important at these lower rpms
There's plenty of flow through the stock exhaust even with that Bend, so it's not a big deal
Then after VTEC kicks in yo, you can see a noticeable increase in the torque
curve the entire way across so there's a little bit of a gap the entire way across from about 6,000 rpm onwards and
As a result power is uniformly up across that that you know range of RPM
So super cool to see you know this was done on the exact same dyno
No changes were made to the car except for that catback and as you can see once flow becomes important
Above 6,000 rpm it actually does make more power with the more efficient pathway of this
Aftermarket exhaust now how can you make more power if you actually didn't make any changes to the engine?
This is certainly a question that comes up so I changed the exhaust it does make more power to the wheels that is a fact
But people question that because it seems strange all you did was change something
after the engine and so to think about it this way so that engine has to push out those exhaust gases and
The easier of a time it has to push out those exhaust gases the less energy as it is spending
Pushing out those exhaust gases so the more energy it can use to power these rear wheels if you have something super
Restrictive if you just have a little pinhole right here your engine's gonna have to work really hard to press out those exhaust gasses
That's that piston coming up forcing out those exhaust gases that requires work to do so that's energy
That's not going to your wheels it's instead going to pushing that exhaust out
Well if you open it up if you make it easier for the car to push that exhaust gas out
Then it's going to have an easier time
Doing so won't require as much energy and as a result you will see higher horsepower at the wheels
Very cool now is it
$2,500 cool
You know I can agree with almost all of you
I'm sure on this and that no it's really not and and this is a learning experiment right this video was done to learn it
Certainly would not have been possible without AutoTempest.com so thank you for stepping in making this possible
and we you know we all get to see some cool data as a result so now let's move on to the final piece of
Data, and that is real-world
Acceleration testing so the way, I'm measuring real-world difference is before and after I'm using this VBox sport
Connects to about 10 to 12 with satellites up in the sky determines
You know your exact location and then measures time differences as you accelerate
So what I did is you know three runs with the stock car in
Second gear only second gear no shifting to eliminate shifting as a variable second gear
We're accelerating from ten miles per hour to 60 miles per hour
We're doing that exact same run three times then taking the average number of those three runs in
increments of five miles per hour now
I will show you the summarized data here so the average of those three runs for each of the increments
Which I measured so you know 10 to 15 miles per hour 15 to 20 20 and 25 and so on
Then I did the exact same test in the exact same location and I'll talk about some of the ambient differences
But basically exact same task just with the catback exhaust
three runs 10 miles per hour
Second gear up to 60 miles per hour took the average of those three runs and then compare them side-by-side
now as a general summary if you take the 10 mile per hour to 60 mile per hour time and
Compare it before and after you're looking at 7.6 seconds with the stock exhaust and
7.30 seconds with the catback exhaust so an improvement overall of about 5%
Which is actually pretty decent considering?
I mean, it's 34 pounds lighter
And you know it's a little bit more powerful and so as a result you do actually measure a real-world
Difference now if we go back and look at our dyno plot
You'd probably expect to see that most of that difference was made in the higher end where it makes slightly more power and that is
slightly true
So if you look at the 10 to 35 mile per hour time the catback exhaust is about 4.8% faster
Versus if you look at the 35 to 60 mile per hour time or that engines in those higher rpm where VTEC starts to engage
It's actually 5.2 percent faster
so a little bit faster in the higher rpm a little bit more performance gain in those higher rpms rather than the lower rpm and
Across-the-board, it's about 5% quicker ok so we have a car. That's 1.2% lighter, and it's 1.4%
more powerful you might not expect to see a 5% power improvement
And I think this is where the ambient conditions come in I try to do my test as close as possible
But it just doesn't always work out and so you know when I did do the catback testing it was 10 degrees Fahrenheit cooler
Pressure was also slightly higher so both of those would help it make a little bit more power on the flipside
Humidity was over double when I tested the catback then when I tested it with the stock exhaust
So that would make a little bit less power, but overall we see a 5% improvement
basically across the board in acceleration as a result of pulling out weight 34 pounds and
Adding a bit of power to the top end about two and a half horsepower so although there
Are you know environmental factors that can certainly affect it it also does have a measureable
Improvement from the dyno and as far as you know obviously you have removed a certain amount of weight
So this has been super exciting for me
Hopefully for you as well learning very cool to see if you have not yet
Please check out AutoTempest.com I've got a link in the video description
Thank you again, Nathan CEO of Auto Tempest and fellow s2000 owner
He actually Auto crosses his super cool to see so check out that website
Thanks again for him sponsoring the video if you guys have any questions or comments of course feel free to leave those below
And if you want to see any helpful links as far as some of the products use things like that in the video that will
all be included in the video description