due to my personal reasons i need to get rid of my car...(528i m sport)
I JUST got the quad set up from royal muffler (
http://royalmuffler.com) not so long ago maybe a 3-4 weeks.. stainless steel it cost me around 1900 dollars but willing to let go cheap please serious offer.
They have done quad conversions many many times for f10 528i's and i know that he is best in the business
Here is another person that got his done from here
http://f10.5post.com/forums/showthread.php?t=531923
i will also let go m5 diffuser and the spoiler together for 300.. or i can negotiate
i am hoping that someone would buy them all together please contact me for serious offer.