I wasn't sure with M4 as they are not as mainstream as the major players, but their quality is equal to anything else out there. They also produce a supper deep sound and improved mid range performance. Very happy and impressed.
M4 Undertail Slip-On Exhaust
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This pipe is much better then the stock pipe on my 2005 honda cbr1000rr. It's loud but not to loud I could easily do a multiple hour ride with this pipe without getting a headache. It has a nice deep tone all the time.
Great look for my yellow and black R1. The sound and power difference is very noticeable.
I recommend them for anyone
This is a great pipe, sound, and looks. For the price it can't be beat. Gets rid of that nasty little heater next to your leg as well, and lets your bike breath. Remeber, a motor is just an air pump, the faster you move air through it, the faster you go, and these things really open it up.Very easy to install as well, which is a real plus since so little is on the 08 R1's.
If your looking for a pipe, get this one, you will love it.