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I currently have Mac equal length shorty headers with their cat'ed h pipe and mufflers/straight tips. I'm thinking of changing over to their long tubes and their 'off-road' h-pipe. There shouldn't be anything else I need to change correct? What other things should I need to know?
Will my check engine light be on if I get rid of my cats?
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well, the check engine light shouldn't go on if you have no cats, just make sure to have the little pipe thats connected near the middle of the H-pipe attached. Its an air injection tube or something? At least that's what happened to mine, i had that removed check engine light came on, then i connected it and it was fine.
13-20 hp gain is what it's claimed from stock to long tube headers, then about 10-15 from stock to o/r h-pipe. will be a slight increase in performance perhaps not the most noticeable, but it will sound quite a bit different. I'd say you'd get around 20 hp +-
331 with 185AFR's with a ton of goodies!
Last edited by saleenpride1986; 03-25-2009 at 12:53 PM.
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