I recently bought a 05 LLY and previous owner had a Hoodstack installed. I bought everything to swap it over to a normal exhaust. I'm in need of v band Clmap though from the Downpipe to Exhaust and don't know what size I need. The downpipe is PPE 3 inch, and it goes to a 5inch Exhaust but the front pipe is only 4 inch? Any help or answers would be appreciated.