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Prelude: I own Audi A3 8v Quattro
My question is: are parts from, for example, apr, compatible for other tuning companies stage 1 or stage 2 tunes? I bring this up because I am wanting to go stage 2 with IE however, I also want my car to backfire without damage to the catalytic converter. Would I be able to buy a cat less Downpipe from another company and still tune my car with IE stage 2 tune? If so what would be any possible problems I would run into? Any responses are appreciated even if you call me an idiot thanks!
 
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