Choke Plate/ Rev Box?

[Wheelie]

I am looking to extract a few more ponies out of the ol' 400. Does the WB rev box/ XR250 rev box make much difference in power and throttle response?

Also is it worth the time to remove the choke plate? If so, will I have to rejet. I am currently running a K&N filter w/outerwear, WB E-Series slip-on, LARGE hole in my airbox lid, 40pj ,158mj, and the clip lowered one notch on the pilot needle.

Thanks for your help.

you probly won't have to rejet for the plate cause you look good enough where your at and the xr250 box is the way to go