Review on 🚗 Dynomax Super Turbo 17667 Exhaust Muffler: Enhance Your Vehicle's Performance! by Jason Sundstrom

My 2005 Grand Prix GXP stock exhaust system was fine, but the exhaust sound was so low/low that it shook the rear of the car slightly under hard acceleration. The installation was carried out professionally. Ultra-quiet exhaust noise and freeway rumble made me return to the Dynomax. Throttle response deteriorated a bit, but hard-throttle acceleration felt a little stronger. There was no particular growl under acceleration, just a deep tube sound and annoying vibrations from the rear. Dynomax backed their 90 day noise protection guarantee and refunded my mufflers.