brewcrew011

My uncle has a 97 z28 with stock exhaust on it, and want to put headers and dual exhaust on it. My question is will it throw a check engine light if it has no cats or anything else emission related to the exhaust? And if it does, is there a way to eliminate it? I figure the car will need a tune anyways with the headers, is there a mail order place that could do it? Thanks

hrcslam

Yes, it will throw codes for each emissions related component removed. You can usually tune out most of them, but the rear o2s will need to be tricked. I don't believe you can tune those out. The main reason OBD was implemented was for emissions standards.

FWIW, I ran a single cat on my I pipe and saw no losses on the dyno at over 400rwhp (although my single exhaust isn't helping) another member here had dual cats and also noted no performance drop with a lot more power.

The only emissions things that you really need to ditch is the AIR pump if you use new style cats and EGR if you install a big cam.

brewcrew011

Ahh, didnt know Lt1 camaros had an after cat o2 sensor like my Ls1. Doesnt seem like many people tune lt1's anymore, is there a good mail order tune that could eliminate the check engine lights and tune a lt1 for headers?

hrcslam

1996 and newer LT1's do have ODB2, that system requires post cat O2's (and Dual cats). You'll have to find an OBD2 LT1 Tuner. I'm not sure if PCM for Less or LT1 PCM Tuning does those or not.

brewcrew011

It seems the 97 has the same general computer/exhaust setup as my 01, except with egr and a few extra things. Hoping it was simpler than that

Cajun ELESS-ONE

go to lt1pcmtuning .com for a mail order tune. people say he is one of the best. just mail in your ecu with the online form submitted. usually takes a week.