Help with S54 swap exhaust issue
I did the S54 swap in my sedan and I'm trying to figure out the best solution to making a exhaust system work with my M3 rear bumper. As most of you know M3's do not have a spare tire wheel well where as non M's do. Right now I have pipes running around the spare tire well but no muffler at all so it's annoyingly loud.
The spare tire well is in the way so I cant put a OEM or aftermarket M3 muffler on. I found this picture of one idea but do you guys think that 90 degree angle curve of the piping will restrict air flow making the car loose performance? I don't really want to cut out the wheel well and risk weakening the frame structure of the car. I'm open to any advice/suggestions.