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Published on Jan 7, 2012
4-1 header custom 2.25 inch midpipe with OEM GSR resonator 06 SI axelback
i highly suggest using the resonator supplied with the 8th gen SI catback to get rid of some of the rasp. i was running this same setup for a few month with the oem gsr muffler and there was 0 rasp but SI muffler opened it up a bit. sounds very good cruising and is barely audible at highway speeds. i give it a 4 out of 5 for a quick bolt on replacement