I installed the stock intake, I lost 3mph I way over did it with the mods so I started to go backwards. First was going back to the stock air box, next I went back to the stock exhaust. The bike still hits 60 easily. I’m still over geared And can’t hit the rev limiter in 3rd or 4th so I’m going to try 15/37. Right now it’s 14/34. The TB cam actually took away low rpm torque and 4th gear is still too tall. I think the cam, self tuning ecu and gears are really all that’s needed To have a 55mph road bike. It’s whisper quiet. I rode with oldct and kept up with his lifan 140.