[tsanterre]

Originally Posted by Slyder27

I had an M4 on my gixxer 750 and now have another on my 1k. With the 07 1k you got the power increase and 18 pounds of weight lost due to stock duals and the cat box. Heavy crap. I think people were getting 6-10hp with just a slip on with that bike. Personally I have a problem bolting stainless to titanium. The bike has a Ti header stock, what the hell do I want a stainless midpipe for? So, it was M4 or racefit and racefit @ 130 dBa....no thanks. M4 with a 12" carbon can it was. I didn't notice any power increase, but I also had the slip on a few weeks before I even had the bike. Rode it home, changed oil and put the slip on....on. So I hadn't had it over 7000 yet.

M4 use to show dyno charts and the gains they got over stock, with no EFI tuning were pretty impressive.

Yoshimura makes some good exhausts too, the Japan exhausts not the USA exhausts. Pain to find that stuff tho

Very helpful. thanks.