Originally Posted by WMichaels
A friend of mine has Borla exhaust on his BMW M3 and the sound is not very impressive. There's another guy that autocrosses a M3 and he has Flowmaster and the sound is much better with the Flowmaster than the Borla. I want to see some performance numbers before I make up my mind on what to do next. :D
I do believe Borla's claim to fame is design and use of the best materials available ! As for how much really changes HP&sound, like the m3 witch had probably avery good system to begin with ,and the xf i would rather have a stock M.B. muffler than a Magnafow!