March 19, 201511 yr I need some advice/knowledge on resonators for my 97 OBS. I had a plugged rear cat and replaced it with a 2.5 inch test pipe. The car runs much better!! But now it is very loud with the headers, high flow front cat and Magnaflow muffler. The stock resonator is very short, maybe 12 inches top. I want to run 2.5 inch from there back to the muffler. Will a stock WRX cat back work? Is it 2.5 inch? I dont want the car to be stock sound, just a bit quieter and less raspy.
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