I wonder how much is there a difference of sound between the two systems.
Originally Posted by sbm3
purchased slip on system. shop commented on ease of fitment
sounds awesome. I am planning on adding the HFC section next. In my opinion, this is everything it was promised to be. When driven gently, is no more intrusive than OEM, but when punched hard, is present in a very inviting way......I can see why BMW would purchase these for their ultimate Road/ Track cars (M3 GTS)