I used the steeda HD eng mounts on my 2010. They came with 4 x red poly bushings..and 2 x black poly bushings. The black ones have a slightly higher durometer, and recommended for higher hp applications. So used one red + one black on each side. (the GT-500 gets 4 x black ones, no red ones included).
I noticed a very slight increase in NVH, but only just above my 600 rpm idle
( automatic, in drive, with foot on brake)... like a real narrow range... 640-675 rpm.
Idle has since been increased to 750 rpm, so it's now a moot point. It was a non issue anyway, since I was through the 640-675 rpm range asap. It was only barely noticeable if accelerating real slow, like easing out from a stop sign, trying to turn left.
A lot stiffer than oem mounts. The steeda hd mounts, like several other similar aftermarket mounts, allowed for either stock eng height... or a 1/4 - 1/2 - 3/4 inch eng drop. I used the 1/4" drop option, so I could have a tiny bit more clearance between my steeda STB and Roush CAI. b4, they were just touching.
But you can only go so low. Go way too low, and the primary #8 on the LT would get too close, and possibly touch the steering shaft.
