Originally Posted by PapiI have a b13 with SR20 with 4-2-1 headers and 2.5 pipe with a blown resonator, which I'm thinking of removing alltogether and replace with a piece of 2.5" pipe.
what effects would a straight pipe setup (no resonator) have on gas mileage, didnt see anyone address this part of it.
you probably won't see a difference in gas mileage, so there is no harm in taking it off. Since resonators have almost zero-flow-restriction, the only difference you will experience is more noise at the certain exhaust notes your resonator used to quiet down.
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cause i don't think anyone daily there car over 4k rpm. 
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