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Hey everyone, I recently installed my active autowerke downpipe, and it sounds and feels great! One thing I did notice is that my fuel economy has tanked, insanely. After I had some fun with it, I topped the car off and managed to burn over half the tank in around 160 KM of highway cruising...

Hey guys, I'm brand new here and was looking for some suggestions as to which downpipe to go for. I already have a CTS intake and am going to go bm3 stage 2. I want to go 200 cell catted mainly to avoid the rasp, I'm already on an awe non res exhaust so I don't want any rasp whatsoever. Does...