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Old Aug 2, 2007 | 05:20 PM
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Exhaust size question

I was thinking about getting the GMPP touring exhaust because it is cheaper than the Corsa. I had a Corsa on my old 2.4 SS and I loved it. My main concern now is the diameter. Would it really hurt me that much to slap on the 2.25" GMPP vs the Corsas 2.5"?
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Old Aug 2, 2007 | 05:40 PM
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Depends really on your performance upgrades for the future.
The GMPP was tested and build on GMPP parts (including tested with GMS2 as far as my research goes anyway)

If you ever intend on putting out more power, be with either things like engine builds or ever a smaller pully, you should really look at putting on a 2.5
As you start adding in more performance, you may get to a point where you need to be at least 2.5, or even 3" (if you ever get that much power, of course)
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Old Aug 2, 2007 | 06:29 PM
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Thats what I thought. I was leaning more towards the Touring models of either one because I dont like interior resonance or extremely loud exhausts. Looks like I'll have to shell out the extra $100 and get the corsa! Thanks dude.
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Old Aug 2, 2007 | 06:39 PM
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Stock Boost = 2.5" Exhaust
S2+ = 3" Exhaust
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Old Aug 2, 2007 | 06:41 PM
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If you go as high as 3 inches you might want to consider your low end tourque. But who needs that in a fwd car eh?
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Old Aug 2, 2007 | 06:41 PM
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Ah shitballs! I hate the sound of a 3" exhaust. Oh well i'll have to suffer with the 2hp loss.
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Old Aug 2, 2007 | 06:44 PM
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Since you already have the vibrant header just complete the package with their exhaust.

P.s.-Do you think with all that will your car fail a noise inspection or a ticket for road noise?
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Old Aug 2, 2007 | 06:46 PM
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Originally Posted by JohnnySasakiMGS
I was thinking about getting the GMPP touring exhaust because it is cheaper than the Corsa. I had a Corsa on my old 2.4 SS and I loved it. My main concern now is the diameter. Would it really hurt me that much to slap on the 2.25" GMPP vs the Corsas 2.5"?
you should just use the corsa you already have, for now. and get other mods instead.
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Old Aug 2, 2007 | 07:40 PM
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Originally Posted by Onyxd04Redline
Stock Boost = 2.5" Exhaust
S2+ = 3" Exhaust
lol, you need to learn to keep your opinion out of posts asking for facts.

Originally Posted by chevysalesman614
you should just use the corsa you already have, for now. and get other mods instead.
key part here is that he had a Corsa on his old 2.4
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Old Aug 2, 2007 | 08:45 PM
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Originally Posted by MaJ
lol, you need to learn to keep your opinion out of posts asking for facts.
Why are you going to give him shitty info and to go with 2.25" pipe?
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Old Aug 2, 2007 | 09:25 PM
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Originally Posted by NJHK

The most important thing to understand in the cases of having an engine that is naturally aspirated or supercharged (turbocharged engines don't run off this method post-turbocharger) is that when you increase the diameter, you are getting rid of backpressure...yes but you are at the same time effecting the velocity of air traveling out of your exhaust system. It's basically taking the good with the bad.

Why is exhaust velocity important? Exhaust velocity does have a direct relation to your powerband and where it is located which is why it's very important for you to pick the proper size exhaust system in the first place. The wrong size can effect your powerband in the negative way (well, negative to you as the user of the vehicle). The slower the velocity, the later in the RPM Band your powerband will be moved to. If off extremely, it will make the performance of your engine very peaky or at worst, make you lose power.
I would also suggest reading the rest of this. its stickied. "most common misconceptions....."
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Old Aug 2, 2007 | 09:59 PM
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I have a good question. Would the vibrant 3inch exhaust move the powerband out of the 6500-7000 redline range?
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Old Aug 3, 2007 | 02:07 AM
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A very good write up by Adam! Which brings me back to why I didn't wan to go with a 3" cat-back. I like having power/torque in the lower end. I don't drive a damn Honda. I like having my peak torque at 4500 not 9,094,500,596,003,923,000 rpms. But that leaves me with the question do I want to the the GMPP and get a little more torque in the mid range and lose out a little in the top end and go with a 2.5 sytem and only gain in the top end.... Damn. Choices choices...

Originally Posted by Herndon_High_SS
I have a good question. Would the vibrant 3inch exhaust move the powerband out of the 6500-7000 redline range?
More than likely. Wait do you mean higher or lower? With just the cat back and a stock header anc cat I would doubt it would move it past the redline.

Originally Posted by chevysalesman614
you should just use the corsa you already have, for now. and get other mods instead.
Because I dont have it anymore and it wouldnt fit anyway.

Originally Posted by Herndon_High_SS
Since you already have the vibrant header just complete the package with their exhaust.

P.s.-Do you think with all that will your car fail a noise inspection or a ticket for road noise?
Cars wont fail an inspection for being too loud. Cops can give you tickets though. You can fail for having no catalytic coverter or a hollowed out one. I can technically fail an inspection because the high flow cat I have with the vibrant header is throwing a P0420 code. Catalyst efficiency below threshold. But I'll have that all cleared up when I get it dyno tuned after my stage 2 install. Cars with high flow cats can pass inspection as long as there are no CEL's.

Last edited by JohnnySasakiMGS; Aug 3, 2007 at 02:09 AM. Reason: Automerged Doublepost
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Old Aug 3, 2007 | 02:43 AM
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i would personally go with the gmpp. its much more realistic, i mean when your driving around town how often do you redline your car?? but if its strictly for the strip then go with the 3"
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Old Aug 3, 2007 | 05:33 AM
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Ok, now I have a question. I have the Megan Racing exhaust right now, which is a 2.5", but it is a little too loud for my taste. I love the way the GMPP exhaust sounds, and I love the way the Borla sounds, but they are both 2.25". I plan on getting a 2.8 and supporting mods, and that would basically be the extent of my major modifications. It is doubtful that my car will ever see 300whp (unless I win the lottery), so do you think it would be a noticable difference with the 270-280whp that I might one day have? I am looking for opinions here, I would sacrifice 3-5hp for the sound I like.
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Old Aug 3, 2007 | 07:29 AM
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I'm talking about a 3 inch exhaust would move it out of the powerband. hmmm anybody with it maybe can chime in.
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Old Aug 3, 2007 | 08:28 AM
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Originally Posted by Schultzay
i mean when your driving around town how often do you redline your car?? "
more than I should

Originally Posted by AjSS
Ok, now I have a question. I have the Megan Racing exhaust right now, which is a 2.5", but it is a little too loud for my taste. I love the way the GMPP exhaust sounds, and I love the way the Borla sounds, but they are both 2.25". I plan on getting a 2.8 and supporting mods, and that would basically be the extent of my major modifications. It is doubtful that my car will ever see 300whp (unless I win the lottery), so do you think it would be a noticable difference with the 270-280whp that I might one day have? I am looking for opinions here, I would sacrifice 3-5hp for the sound I like.
If i were you i'd get the corsa touring. Its 2.5" and it sounds awesome without being too loud. My buddy Edubs has cams in his Balt and has almost 290 WHP. And all he has is a header, intake and a stock catback.

I was told that Megan racing is actually a cheap eGay knock off of Mugen racing.
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Old Aug 3, 2007 | 08:36 AM
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Originally Posted by Schultzay
I would also suggest reading the rest of this. its stickied. "most common misconceptions....."
Nice. Someone used what I said in the write up

Also, the write up about intake and exhaust resonating goes into deeper details on exhaust systems and how they play a role in with everything.

If you want my opinion, there is no need to go larger than 2.5"

Last edited by NJHK; Aug 3, 2007 at 08:36 AM. Reason: Automerged Doublepost
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Old Aug 3, 2007 | 09:00 AM
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Most likely when I get my exhaust I'll go with the 2.5", just because NJHK said so. And also because I'm afraid of his buttsecks.
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Old Aug 3, 2007 | 09:00 AM
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Originally Posted by Herndon_High_SS
Most likely when I get my exhaust I'll go with the 2.5", just because NJHK said so. And also because I'm afraid of his buttsecks.
I can be gentle...
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Old Aug 3, 2007 | 09:22 AM
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Your black. There is no such thing as gentle.
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Old Aug 3, 2007 | 09:23 AM
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Originally Posted by Herndon_High_SS
Your black. There is no such thing as gentle.
Gentle = No bleeding

lol
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Old Aug 3, 2007 | 09:25 AM
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I actually just LOL'ed.

On a gentle note, I'm not racist. I have a colored tv.
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Old Aug 3, 2007 | 09:33 AM
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Originally Posted by Herndon_High_SS
I actually just LOL'ed.

On a gentle note, I'm not racist. I have a colored tv.
lol

That actually made me lawl too

+1 Rep (check your rep message)

Last edited by NJHK; Aug 3, 2007 at 09:33 AM. Reason: Automerged Doublepost
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Old Aug 3, 2007 | 09:44 AM
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I would rep you but they wont let me. Maybe some other time.
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