Dont worrie about people laughing at you, my buddy bought a 3000gt vr4 off of ebay. I drove to denver to pick it up. Great road trip but, when we got back he left it stock looking and did up the motor. And he added 2 phatom turbos (the largest possible one they make for that car) invested around 15k into the motor. The speed on that thing was sick. You do something like that your not gona get laughed at if its done right.
But if your looking for a stupid loud exhust like the ricers have and do all the leds etc and sht like that. There is a diffrent story I will start the laughing.