Here is a post of an 800XM w/aerocharger on it and pdrive
2016 x 800XM w/Aero @ 5psi.
BRP 850 turbo ramps
pivot pin kit
Dalton 135/335 primary spring
Dalton yellow/orange secondary spring
One of my helixes.
There is some actual feedback.
www.dootalk.com
Plus, I bet I was the first one to mount a Pdrive on an 800XM because I had one to mount on an 800XM Aero w/5psi before there was a 850 summit.
We used 951 ramps and an assortment of iBackshift parts; that sled is still going up and down the mountain and will be again this winter coming up.
To conclude a TRA is better than a pDrive....lets see some facts with personal first hand knowledge to prove that conclusion from a test framed to set out to do so and have results.