I just installed the Street Unit MM and man is it sweet. The car has 1,100 miles on it and I was tired off the wheel hop when I would accelerate though a corner but that has disappeared. But what I am concerned about is the film of oil that seems to be coming out of the motor. I am going to take it back to the dealer so the can check it out, but that means I have to put back the original mount first so I don't get the "you voided the warranty speech". My last car was a FORD F150 (P.O.S.) This is my first Mazda I love this car and I hope my visit to the dealer goes well.http://www.streetunit.com/MAZDASPEED..._p/sum3amm.htm