Quote:
Originally Posted by Zajac1
That 328i from 2nd video sounds like shit comparing to 128i with 135 muffler.
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the mod was literally just done.. the ECU which was tuned to the stock exhaust system and now learning the changed muffler. 500KM later it will sound much better then that.
either the 135i muffler or PE mod works for a high flow exhaust. borla has a good muffler as well.
dont delete your resonator, delete your secondary cats. the resonator is very well designed and creates a type of backpressure thats good for your engine getting rid of unwanted drone and frequencies while having no effect on power gains. TheAxiom- mentioned in a post you lose 2-4 ft/lb of torque unless you fit an x-pipe(which makes the car sound and flow better) but, you cannot fit an x pipe on n52 style exhaust system. the secondary cats are absolutely useless unless you are running catless headers. removing is what you want when chasing the pe style exhaust.