Next Gen Rocker Panel detail set includes a new exhaust end and flange for the body and the cooling vents. Set does both sides. You will need to cut out the existing exhaust ports that are molded in the body and file the opening until the flange fits snug and cut out the existing vents. You will also need to cut out or sand down the nub that i have circled in black in the picture above on the undertray. I did this in about 5 minutes using a Dremel with a cut off wheel disc and then filed it square with a diamond file. You'll want to file up to where the rocker line sticks out from the body so that the line from the rocker is gone.
