Test Pipes - NSX (91-05) - ResonatedPride Exhaust Resonated Test Pipes for the Acura NSX are direct bolt on for all 91 94, 95 99, 00 05 NSX's. The small resonators incorporated into our test pipes act like a glass pack or small muffler, designed to mellow out the tone of your NSX exhaust tones. These do replace your catalytic converter. The resonators are designed to break up the sound of each combustion, generating a smoother hum and reducing drone in the exhaust system. Our V2 Pride