I have catless, and I can tell you it sounds and performs amazing.
I know badblack has a catted downpipe and he also reports gains.
So you have to ask yourself if the Smell will bother you, because if you like to cruise w/windows down.. the smell is very noticeable, I'm use to it and dont really mind. But its there, and the only drawback.
If I were to do it again, I would go catless, costs less, more gains, windows up.
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2020 X3M CP - IND Reflector set | Ceramic Tint
Retired:2015 M5 CP MSR Intake|Carbon Fiber Fender Vents|Meisterschaft GTC catback with LXR mid pipes and ER Catless DPs | BPMSPORT Stage II Tune | RKP Rear Diffuser and Challenge Center piece |RKP Front Lip| Painted Reflectors | H&R Springs | Strasse SM5R Carbon Fiber Wheels | Nitto R888 |
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