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One thing to consider is cost. The downpipe is going to run you ~$450 and the catback, around $2k. In addition to sound, I believe the downpipe will also net more hp than the catback (someone please correct me if I'm wrong), especially since you have a tune.
After typing this post, I'm kinda regretting going AWE catback instead of just the downpipe with a res delete.
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2022 CT4-V Blackwing 6-speed
SOLD: 2016 340i xDrive 6-speed
DAW v2.5 turbo E40 | Dorch S2 | VRSF DP | MST intake | AWE catback | 335is clutch | CSF heat exchanger | RK Autowerks intake manifold | Orange M Perf Brake Kit | KW Street Comfort coilovers | GTS taillights V2
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