Here is my unscientific comparison vid of the 2 bros , Q4, and HMF. May help.
Dan
https://www.kawasakiforums.com/forum...ad.php?t=32162

 

I use the Two Bros M7 and alternate between the P1X and the P4 or P3 on the street. The P3 is without doubt street friendly but also restrictive. Only five minutes to change when you reach the trail. I replaced the Torx head bolts with allen key type from Tastynuts.com.
http://www.tastynuts.com/Products/Al...lts_socket_cap

 

Thanks all for the advice, I think I'm going to go for the M7 over he Q4, only because Ive read the Q4 doesn't match up too well to the sock header pipe.

Cheers