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Originally Posted by 2023_ZL1-AUTO
As 2023ZL1 mentioned above, The CPS long tube headers by Stainless Works are great and were easy to install by myself! I went ultra high flow CATs as well that CSP recommended. Additionally, I went with the Corsa Xtreme NPP axle back and got rid of the stock suite case. At the same time I replaced the reset of the stock exhaust (x-pipe etc.) with full 3" Street Engineering stainless. That took quite a bit of massaging, but I got it done. After it was all said and done, the sound of my car at idle was awesome! But at RPM / WOT and just cruising around in manual shift mode, I disliked the hollow/tin can sound my exhaust had. After a while, I went back to the stock X-Pipe (that was a pain) and still with the Corsa Xtreme NPP, it sounded better but still had that raspy tin can sound. I then replaced the Corsa Xtreme NPP with Stainless Works Legend NPP (Classic). I now really love the way my exhaust sounds. At RMP and WOT it sounds great, still loud but much deeper sounding and reminds me more of a classic muscle car tone. I do have slight droning on free-way at 65/70 if I'm in full automatic mode and RPMs are under 2000. But if I'm in manual mode and keep RPMs right at 2000 or more its good and no droning. The funny thing is, now my idle doesn't sound as good, it's much quieter at idle than the Corsa Xtreme was. If I could have the sound of the Corsa idle and the rest Stainless Works that would be perfect! I guess you I can't have cake and eat it too!!! Still not 100% sure why I selected 2" headers I'll never have high horse power with my setup, and I wonder if that has something to do with the over all reason I thought the Corsa Xtreme sounds too raspy/tin can'ish?
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Hey, with you going back to your stock x-pipe, did it affect your performance at all? I just installed stainless power headers. But the shop could not install the cats with the 3 inch speed engineering x-pipe I put on earlier this year. I also just had Mayhem motorsports near me tune it and it is running GREAT.
I'm considering putting the stock x-pipe back on which will allow me to put on the cats that came with the headers. But the tune was 800 dollars and I don't want to mess up the tune with putting the stock cat back exhaust on.
I made 452hp and 471 torque. Nothing compared to you, but I have only spent about 1700 for headers/flex fuel/LT2 intake and ported TB. Plus the 800 for the tune. Unfortunately I don't have a base line. But going off the stock number with a 15% decrease from crank to wheels, I gained about 65 with those mods. I just don't want to mess up the progress with the tune I just got.