Originally Posted by GhanemMBN
trust me Simon, we couldn't of done it without the MHR exhaust! The hp gain from the MHR was more than Akrapovic! There will be a full engine mod and will be also installing lightweight products. Unfortunately the best time the M5 got yesterday was 11.505, and ofcourse the tyres were in bad condition. The reason I said ask MHR is because you we're there when the made the first dyno run, and because it had the MHR exhaust. Sorry if it sounded a bit wrong, but I meant nothing else. Both PP and MHR are great tuning companies!
haha no worries..
thats why i clarified it for the others..