I did this exhaust mod yesterday. I thought, WTF, $50 is a lot cheaper than a Borla, Magnaflow, UUC, Quicksilver... Took it in to a local performance muffler shop. 30 minutes and $50 later it's done. It sounds good, kind of burbles like my '71 280SE Mercedes used to. I'll have to wait until next Sunday on the track to see if performance is increased.

 

I did this mod today and I have driven the car 25 miles and all I can say is that at freeeway speeds the sound is quieter the difference is at wot the sound is like the red mini in the italian job I also have the pulley and minipilo intake, now I can wait as long as it takes for the exhaust to come down to realistic prices 350 dollars if not the one I have is perfect