Difference in exhaust sizing - 2.5" vs 3.0"
07-31-2018, 07:23 AM
#1
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Difference in exhaust sizing - 2.5" vs 3.0"
I have a 2010 GS Vert without the NPP option and am looking to replace my exhaust. I don't know where I'll start, axle-back or headers back, but ultimately I'll replace the entire exhaust system, headers-back. I am going to replace the mufflers with the Corsa Sports and use Kooks long tube headers but was wondering whether I should replace with 2.5" or 3.0" pipes and mufflers. Does one really make a performance difference over the other? Does one have that noticeable of a sound difference over the other? I don't want an obnoxious sound, just something good when I hit the gas. I've had Corsa Sport before on a 2006 so I know I'll stick with that exhaust.
The following 2 users liked this post by SXGT:
Ask12b1 (08-01-2018),
Mike's LS3 (07-31-2018)
07-31-2018, 08:08 AM
#3
Burning Brakes
I have a 2010 GS Vert without the NPP option and am looking to replace my exhaust. I don't know where I'll start, axle-back or headers back, but ultimately I'll replace the entire exhaust system, headers-back. I am going to replace the mufflers with the Corsa Sports and use Kooks long tube headers but was wondering whether I should replace with 2.5" or 3.0" pipes and mufflers. Does one really make a performance difference over the other? Does one have that noticeable of a sound difference over the other? I don't want an obnoxious sound, just something good when I hit the gas. I've had Corsa Sport before on a 2006 so I know I'll stick with that exhaust.
08-03-2018, 03:53 AM
#5
Here is an actual test on performance. not an LS2 but you get the idea.
https://www.youtube.com/watch?v=o5z-zCnRl0I
https://www.youtube.com/watch?v=o5z-zCnRl0I
08-03-2018, 04:01 PM
#7
Race Director
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C6 of Year Finalist (performance mods) 2019
The video showing a HP increase, was using a 454 block and an aggressive cam. The 2.5" pipes were creating a restriction, just like 2.5" pipes would do on a LS7 or a LS9.
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mikeCsix (08-09-2018)
08-07-2018, 12:52 AM
#8
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You just changed the game. The 2.5" pipe size is better for a basically stock LS3, but 3" works best if you go to FI. It's all about the volume and temperature that creates the highest velocity in choosing pipe sizes.
The video showing a HP increase, was using a 454 block and an aggressive cam. The 2.5" pipes were creating a restriction, just like 2.5" pipes would do on a LS7 or a LS9.
The video showing a HP increase, was using a 454 block and an aggressive cam. The 2.5" pipes were creating a restriction, just like 2.5" pipes would do on a LS7 or a LS9.
08-07-2018, 01:33 AM
#9
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I have a 2010 GS Vert without the NPP option and am looking to replace my exhaust. I don't know where I'll start, axle-back or headers back, but ultimately I'll replace the entire exhaust system, headers-back. I am going to replace the mufflers with the Corsa Sports and use Kooks long tube headers but was wondering whether I should replace with 2.5" or 3.0" pipes and mufflers. Does one really make a performance difference over the other? Does one have that noticeable of a sound difference over the other? I don't want an obnoxious sound, just something good when I hit the gas. I've had Corsa Sport before on a 2006 so I know I'll stick with that exhaust.
NSF
08-07-2018, 08:36 PM
#10
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thanks. unfortunately, it wasn't on my car. i guess you're saying i may need to invest in a mild-to-wild?.?.? lol