My friend has a 06 M5 (the 500hp v10) with deleted cats,resenators, and muffler. I raced him in my 01 C5Z06 with Full exhaust,CAI, and tune. We ran 4 times from 60-140 the first 3 times i ended up at this bumper, the last it was pretty damn even. We could only go from 60 since im on OEM street tires no traction at anything below 60 and it was very very cold out, DRs are coming soon. all of 3rd gear it was pretty damn even but when i shift into 4th he pulls ahead a little my shifting could be better. It was a great race and my first death!