except that most often car manufacturers sacrifice real world FE or real world speed/performance for paper HP and emissions ratings. That's why you CAN improve power and mileage over stock with intake pipes, headers, exhaust work.
Yes, you'll hear more induction noise (hissing under load) and more than that, it depends on the specific kit vs your stock setup. some can barely be improved upon, some are terrible
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-Russell
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
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