depends a lot on wich stage. stage 1 is just suspension/ exhaust- stage 2 adds brake upgrade, more suspension stuff, and chip. stage 3 is supercharged. drove stage 2 and stage3, stge 2 is barely faster than std gt which i also drove. stage 3 is probably getting close to stock tt. stage anything tt probably walks away. nothing tech here just seat of pants feel. way too much money for what you get, about 12-15k overpriced IMHO.