You might wanna look into hacking an inch or so off the stinger. That pipe is gonna push the motor really hard into the over rev..
How long is your head pipe?? Cause that could be a huge performance factor, and kill what that large chamber is trying to do.
Just remember this:
The longer your head pipe, the sooner the powerband will come on. And of course the shorter it is, the later it comes on.
I really did my homework on this with the trx250 FMF pipe, and after hours of crunching numbers, we came to the conclusion that a 13" long head pipe is about perfect with stock ports.
We also came to the conclusion that using thinner 2" OD pipe to make it works just fine to..
Another thing that might cause some issues is the static compression, and port timing.
The trx250r has a way more aggressive port design than the 465, and more compression.
Though knocking about .015 off the squish on your motor might make up for that, and push a stronger exhaust pulse into that huge ass expansion chamber. Thus allowing that pipe to actually work the way it was designed.. lol
(Though if you drop the squish to much you can kiss running pump gas good bye)
You might know all this stuff, and you might not.. I'm just giving some friendly advice.
