27" tires, 22 gram weights, HMF exhaust, Weller ECU flash, Hunterworks sheave, top speed 64 MPH. IF TOP SPEED IS YOUR GOAL, even 18 gram weights may still be too light. Don't believe the crap that the HMF exhaust is the problem, it's not.
Forgot to add: X4 with roof and full and I'm at 5500'. Not only do I have more drag than an X2 but I'm suffering a minor HP loss as well (I don't believe I'm losing 3% per 1000 ft though as I believe air resistance is less so actual net loss is less)
I'll add you to the list once your setup is finalized and congratulations (video proof of top speed would be appreciated on flat ground)