Hey guys this is my first post so go easy on me. I have a 2001 S4 with hardly any mods. I have stop tech brakes and ssr 18 inch wheels. I want to chip my car but I can't seem to choose one. I deal with Istook racing in Fort Worth Texas and they say REVO is the only chip to use. I have looked at MTM, AMS, GIAC and REVO. Any help would be greatly appreciated.