My friend has an 05 V6 silverado. He wants to put exhaust on it. now he isn't stupid he wants it loud but he also wants it to perform well and bettter economy and so on. He will go all out and even get headers also but he is askin me what the best thing to do is. Now i have no idea because its a V6 and im not even sure about V8's. but i told him i'd find out. Any ideas?