basically the dump tube is like that for max power, and the smaller pipe is going to his stock exhaust so, when he isnt running the car hard, he can still retain the stock sound to his car. quite an ingenious setup, actually. now that you guys pointed this out, it made me want one. ive always been a fan of cheezefrogs ek. the vid where he races a 10sec viper is the sickest. gotta love those srr control arms!! :yumyum: