I ran an 18" resonated FI CF exhaust for several months before it was destroyed. I ordered the exact same exhaust as a replacement but with non-resonated mid-pipe. I am much happier. Pretty much the only difference is noticeably more drone on the non-res version with a heavy throttle at low RPMs (like <2K). So if you're cruising at 60 mph in 6th gear and goose the throttle, you'll get a fair amount of drone (no one does that ... or at least no one should be complaining about it). Normal and spirited driving will have either exhaust configuration singing a beautiful note. Keep those RPMs up
