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4" vs. 5" exhaust and downloader ?????????

958 views 7 replies 6 participants last post by  GET R DONE6.7 
i hade a 5" straight pipe on my 06. real deep and loud but had a drone around 2k. i put a aero 5050 on it and sounded the same but no drone. 4" is louder and a bit more raspy. imo 5" is the way to go. lower egt's as well
 
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