Performance Exhaust System For M56S

[kensm56s]

I noticed that Stillen has released a catback performance exhaust system for the M56. I can't find any information out there as for the HP gains one might expect on this catback system. Does anyone have ideas about the expected HP gains for this system? Or is there another catback system out there that might result in more HP gains? Thanks

[donnieb83]

I've read that their exhaust for the M45 is around 10whp to I would expect the same if not more on your M56. Check out you tube, someone has a custom setup on his M56 and it sounds like a muscle car upon start up. Hope this helps!