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but wouldn''t making the engine breathe better and make it not work so hard to push exhaust out make it better? less resistance makes a difference like synthetic oil.
well i had a 3" cat back exaust on my 93 integra and it was still no faster than a stock one... and the best fuel eco i got was 29 mixed on 91 octane...
well did you make it breathe better and the intake side? What I''m saying is the engine won''t work as hard to take in air and to expel exhaust. less work more hp and maybe a little more mileage