Quote:
Originally Posted by gdgraph
Headers drastically reduces back pressure, that's why you'd want to tune, to re-calibrate the timing. If you do headers your warranty is gone, so what's the point of not getting the tune... you won't see significant power gains and would probably throw a CEL for the reduced back pressure loss.
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Recalibrate the timing?
I disagree about power, with LTs you will see most of the gain without a tune and while you will get CELs its because you moved the rear O2s too far downstream. So one of the main benefits of the tune is suppressing those CELs.
I am not necessarily recommending doing LTs with out a tune. But I have done it and picked up 3-4 tenths in the 1/4, drag raced often, read and turned the CELs off often, and drove the SS as a DD for about 2 years. Never lost my warranty, then put it back to stock, and got top trade in $$ for my SS. Although I did get dinged for needing rear tires.
