Has anybody monitored changes in fuel econmy after upgrading intake and exhaust systems? If so, please post your results. Feel free to mention performance increases as well.
Did you change the tranny out?Exactly what I was going to say. I haven't opened up the full intake/exhaust path on a car in about nine years, but the last rice roc... I mean, CAR... with which I did this (intake/header/cat/exhaust) had the RPMs at 60mph drop by ~900. If nothing else it at least lets the engine work less to achieve the same results...