I want to go custom for my car. I've been doing research on the F-Max kit and I'm waiting for the details on the Drag 4 kit. I'm starting to decide to go custom. Does anyone have any piping plans for a F23 engine? I want to keep the A/C in my car. I'm planning to do it in late Feb or March during spring break so I can install it myself. I went to a muffler shop and they say they can do the piping for like 300-400 but I need to provide the plans.