they are not the same... you guys keep on helping me with new info and now i have different questions. first was between custom and greddy. you guys said greddy ..now i'm hearing about other exhaust like the B& f ing B and now i have more f ing questions. I'm sorry i thought that's why this twin f ing turbo . f ing net was here.... sorry for yourrrrr inconveniance. But remember you do not have to type those little f ing keys in front of you if you don't want to... thanks for your time... dan p.s i don't mean to be the f ing pu%$^ one to say this