i've looked at graves, and M4 and FMF. anyone know which is preferred?
Good looking bike!
I've had the Taylormade, the M4 GP and now the Graves full.
Wasn't too happy with the quality of the Taylormade so I sold it.
The M4 GP I had for a while longer and enjoyed it, eventually it got too much with the noise level (both for my ears and the track noise certification level). So that was sold when I bought my Graves full system.
I would say, go with either the Graves slip on or the M4 Street Slayer just based on sound and fitment. Personally I like the low mount exhausts that bolt up to the rear set as compared to those that bolt up high to the rear passenger peg. If I don't have the girl on the back (once or twice a year), I have them removed.
Performance wise, get anything that removes the stock cat. The stock cat and pipe is probably a good 20 pounds of metal not to mention it restricts the exhaust flow slightly.
Have you looked into flashing your ECU by chance? That, with a slip on, will take the bike to the next level and make it an entirely new beast. I do offer a flashing service here on the forums. You can find more info in my sponsor forum here; https://www.zx-10r.net/forum/showthread.php?t=218786
if you have any questions feel free to ask in that thread or shoot me a PM!