its pricy but go with a RB C6 or WS7 2045 pipe and 92mm header you will fall in love.You will have to spend more up front but you will have less problems later on. i have a c6 9-10 gallons every things original
take you time on the break in DONT RUSH and shell last you a long time
take a look
part 1
http://www.youtube.com/watch?v=QUIhhx5oElM
part 2
http://www.youtube.com/watch?v=BDS1T35qzy8