Everyone has their favorites, sound quality is subjective but I like 3” Dynomax Ultraflo’s. I use the round ones part# 17223 (on a van) I remove them along with the short 3” head pipes at the track as all combined I save about 50 lbs. The oval versions part# 17220 are “supposedly” one of the best flowing (based on some older tests easily researched) Never really noticed any differences in times at the track back when I did switch back and forth though. Running much quicker/faster now and haven’t bothered comparing with and without. May be better flowing mufflers now as the marketing of “bestest” never ends when it comes to mufflers:rolleyes:
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