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SSIs and an M&K muffler reminds me of something I've always wanted to ask, so I am very glad this thread was started.
Does the act of simply replacing a stock exhaust with a less restrictive header exhaust automatically increase horsepower? Or does the engine need to be re-tuned or rechipped to take advantage of the new exhaust? I would think the latter since the engine timing and cam is the same as it always was, right? Is it like having a larger diameter garden hose but not turning the faucet any higher? To take advantage you need to turn up the faucet?
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1986 Bosch Icon Wipers coupe.
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