GXP25, I would say very little if any. The only thing I noticed after the cradle and differential bushings were replaced with those Superpros was mostly noise related. I'd hear the differential clunk a bit more than I did before.
The front cradle bushings came out with the press I made with a threaded stud and some washers & sockets. A correctly sized steel pipe works well as a receiver for the bushing.
The rear ones are taller and the rubber piece tore out, but the plastic remained. I carefully scored the plastic with a hack saw (enough to score but not cut through), and I was able to tap them out. One of them had to be scored in two places to create enough flex to make tapping out a breeze.
In order to get the saw in there, I took the blade off, turned the blade backwards (saw teeth toward handle), and then placed it inside before reinstalling the blad and it was easy.
Mind you, I had the subframe out of the car when I did it.
The differential bushings are harder to get out with the differential still in the frame.
'09 PSM G8 GT - OPG Intake, DOD-Delete w/ Stage 1C 218/229 .600 Lift 117.5LSA, Kooks 1 7/8 Mids, Solo Axle-Back w/ X-Pipe, SuperPro Bushings (Front and Rear). BMR Sway Bars (Red)
"If you want to criticize someone else's work, be sure that your own is in order first."