Recently baught my FD, and have a couple of qs
 

Hey guys. i just got my FD and loving it. but i have a few qs since i am new to Mazda! The car has about 75,000 on the chassis, and so far i have replaced all the rear bushings, rear diff bushings and put on some used shocks, obviously in better condition that mine were, and some springs, i am not sure of the specs but they are a bit stiffer than stock. now my q is, i know they are stiff as it is, i dont mind that at all, but is there any other way to fix interior noise, i do a lot of city driving, and in LA the streets are like a war zone, i am sure some of you know, i would hate to ruin the car, and hopefully fix some of this stuff, just to see if some of you have any suggestions?

Thx,

Eli