I use the P4 as well and also carry the P1X if I have to pass through any areas heavily infested with cops. Works a treat.

 

I bought a P1X, on it's way to me now, do you notice a drop in power from the P4?

 

Yeah I think so. Noticeable only down low but it's not much and worth it to keep the cops off your back.
I definitely prefer to run with the P1 or P4. I've ended up with all three tips and the spark screen somehow so I tend to swap them on a needs basis.

 

Cheers mate, will consider getting a P1 too.

 

I had a p4 tip. i took my bike to get dyno tuned. and the torque curve with the p4 tip and without was significant. Ill deal with the noise to have the torque curve i have now.

 

No race only has no cat in it ^