Hi Unless your car is producing some high HP numbers, you will actually lose power. It will also be ungodly loud. I have the supersprint resonator and a brullen muffler, and that is already loud, a few years back, i cut the resonator out and put straight pipes...meaning header straight to muffler, i actually lost some torque, but maybe gained a few way up top...and it was loud (a cop heard me 2 blocks away)