Originally, I had the local Roush dealer install the small M90 blower + lowered roush suspension.
With the front lowered 1" ...and the rear lowered 1.25" it was a disaster .
With the rear lowered 1.25", the oem LCA's were no longer parallel to the ground, but 1.25" higher at axle end...= gross amounts of wheel hop. Lost it 3 times, in the wet, just going across town to the dentist and back. It would pull to the left with my foot into it, just a bit (not even into boost, not even remotely close).
Stopped right there, and in went the BMR boxed hd LCA's, adjustable BMR UCA, and BMR lca relocate brackets. Started off using the top holes in the BMR lca relocate brackets, then a year later, moved em down to the middle holes. Also installed the BMR on car, adjustable PHB..and a bunch of other stuff.
(oem lca's were trashed)
Later on, replaced the BMR adjustable PHB with a white line watts link. That stopped the skittering, when flying around bumpy corners. On the same day of the watts link install, we also installed the eaton tru trac LSD..and also the DSS-DS one piece DS.... plus the bobs motor sports catch can for the rear axle.
Oem LSD leaves a lot to be desired. Even the GT-500 carbon fiber LSD discs are semi useless at best, they will melt, resulting in the dreaded...'one wheel peel'.
Also added the BMR rear 1/4" thick steel plate, plus DS safety loop. Then installed the steeda chromolly steel triangular braces on each side of the BMR plate, so it now forms one homogenous brace from side to side...(welded and bolted). Then added the steeda rear strut brace in the truck, between the shock towers (welded in). Then a bunch more stuff to the front end.
Then rears went from 275-40-18 to 285-40-18, then 305-35-19 (MPSS on the 305's..with 28 psi on the rears). With my paltry 390 rwhp / 375 rwtq, it's a handful. Just holds in, when mashed in 2nd gear. 2nd gear in the 5r55s is 14% lower than 2nd gear in the manual. And this is with the oem 3.31 rear gear. (3rd gear in the 5r55s is 16.5% lower than 3rd gear in the manual).
So yeah, make damned sure u tweak the suspension. I learned the hard way, and did it after the fact.
With any auto... plus a PD blower, mash the gas and you get (instant boost) + tranny drops down gears = hang on for the ride.