anyone running 2" headers and 3" exhaust?
09-17-2018, 08:50 PM
#1
Melting Slicks
Thread Starter
anyone running 2" headers and 3" exhaust?
Anyone running this set up in a C5Z? What brand headers and mufflers? I'm thinking my 1.75" headers and 2.5" pipes are choking my LS7
09-17-2018, 10:27 PM
#2
1/4 mile/AutoX
we are running ARH 2 inch headers with Borla type S /// 3 inch all the way back !!!!! Monster !!!!!!!!! (C 6 Z 06 )(for what that's worth ???)
09-17-2018, 10:28 PM
#3
Le Mans Master
Not speaking from experience, but I'd say 1 7/8" (or even 2") headers into 3" would be best. The LS7 had 3" in the C6Z...
The 2 1/2" is more suitable for 346CI
The 2 1/2" is more suitable for 346CI
Last edited by grantv; 09-17-2018 at 10:28 PM.
09-17-2018, 10:31 PM
#4
1/4 mile/AutoX
more air in / more air out = HP !!!!!!!!!!!!!!!!!
09-20-2018, 03:11 PM
#5
Melting Slicks
Thread Starter
Thanks guys. I guess what I'm asking is that I have an LS7 in my C5. Will a 2" header and 3" straight through exhaust fit and if so, who makes it for the C5.
09-20-2018, 05:24 PM
#6
Le Mans Master
I think Stainless Works and Kooks make 3" mids, many 3" mids taper to 2 1/2" at the rear joint. I'd call Kooks and/or ARH to start.
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jerkyboy (09-20-2018)
09-20-2018, 10:52 PM
#7
Melting Slicks
All the research I’ve done says it doesn’t matter which 2 inch header you go with you are going to have to modify the headers and the car to make them fit. On my ls7 swap I decided I would rather go with a 1 7/8 header and take the HP hit for ease of install.
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jerkyboy (09-22-2018)
09-22-2018, 10:30 AM
#9
Melting Slicks
Thread Starter
This is the info I'm looking for. With the 1 7/8" are you dumping in to 3" all the way back and in to 3" mufflers or are you necking down to 2.5". I'm currently running my old 1 3/4" into 2.5" pipes and mufflers (hi flo cats). I imagine its choking the motor a bit but may be why I have pretty high torque numbers on my set up.
Thank you
09-22-2018, 02:56 PM
#10
Le Mans Master
most manufacturers can set up the mids per your needs. my ARHs are 1 7/8 into dual 3" that end with 2.5" flanges to bolt to stock-size axle-back (but i welded in cutouts behind the diff). if you want 3" mufflers, they can just use 3" flanges on your mid pipes 
09-23-2018, 04:46 PM
#11
Team Owner
Any good muff shop can build you a nice system. A friend of mine in Novato, Ca. built mine. I run 1 7/8 headers with full 3" dual exhaust. I purchased the X pipe and used Random Flow full flow cats, he put it all together.
Last edited by tiojames; 09-23-2018 at 04:47 PM.
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jerkyboy (09-24-2018)
09-24-2018, 05:49 PM
#12
Melting Slicks
This is the info I'm looking for. With the 1 7/8" are you dumping in to 3" all the way back and in to 3" mufflers or are you necking down to 2.5". I'm currently running my old 1 3/4" into 2.5" pipes and mufflers (hi flo cats). I imagine its choking the motor a bit but may be why I have pretty high torque numbers on my set up.
Thank you
Thank you
09-24-2018, 06:17 PM
#13
Le Mans Master
09-24-2018, 09:48 PM
#15
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you can still make good power through 1 7/8 headers with a supercharger... I always wondered if my car would pick up anything if I modded my corsa xtremes to 3", I would do it but I don't know if the gains would be worth the cost