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Hey guys was wondering should I get a 3inch cat back exhaust or 2.5 is there any difference. Mind you I’m in Cali so I’ll be fully catted no tune at least Not until my warranty runs out ( maybe Jb4 in the future) and on 91 pump.
 

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My '17 Q60 Red Sport w/FI 3" Full (Catted) DPs & FI 2.5" CBE (Resonated) made 437 WHP & 502 WTQ on a DynoJet AWD Dyno on 93-octane pump gas.

The 2.5" CBE is more than sufficient for any of your present and future mods.

If you are in the vicinity of Simi Valley, stop by Fast Intentions and speak with Kevin. He's installed CBEs on many VR30 Q50s & Q60s.
 

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Each person I have heard provide feedback on 3-inch cat-back exhausts has said that it has awful drone and rasp.
 
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