Well, I bought my exhaust from Bryan Howell on here he owns www.dieselpowerproducts.com he is a great guy and very knowledgeable and easy to deal with (good company to buy from). I recieved my exhaust quickly and I plan installing it tomorrow morning at the shop I work at. It is the five inch system turbo back from Diamond Eye. I was wondering, will my stock down pipe off the turbo work with this? On the turbo starting side of the exhaust it shrinks down to 4" do you think it will just bolt on. The truck is an 2004. 5 so it has a stock 4" exhaust. Sorry to be rude but I need quick responses because I am doing it tomorrow morning. thanks - Bobby