I have a street ported 86 rx7 NA .and I am doing some suspenions upgrade. I have replaced front with poly bushings and after market sway bar, ball joints, tierods, Tien springs, racing beat adjustable end links , and monroe struts. The back I have replace lower control arm with poly bushing, aftermarket sway bar, Tien springs, monroe shocks and racing beat adjustable end links. Now I'm getting ready to install Mazda Trix competition (40% stiffer than stock), Rear diff mounts, diff stop washers, front diff mount and stock RLCA upper bushings, stock RLCA LWR @ hub bushings and stock seals and a Mazda trix adjustable camber rod(sub-link). I would like to use MMR rear subframe mounts, but Mazda trix says with my suspension set up they are too stiff and I should use Their OEM rear mounts. I need help is Mazda trix telling the truth or just trying to get me to purchase thier OEM mounts instead of MMR mounts?

 

I wouldn't recommend solid diff or subframe mounts unless you want to hear every bit of gear and road noise in the car. Those mounts really are unpleasant.

 

Aaron, Thanks for your expertise.