you may cut the stock exhaust right where the DP straightens out. and be careful, your probably going to need to adjust the DP, they tend to hit the back of the head if its a true 4" DP. mine did even after the i adjusted it, and it was the worst droaning sound ever. i had to remove my entire DP again to make more adjustments ( hitting the DP with a hammer to create a dent so it wouldnt hit) other than that, youll LOVE the new exhaust im sure.