Smaller header to a mega phone then reduce to the muffler. It's hard to get it right with no room. Short & smaller dia. more bottom end power. Make sure to kept the battery box high so the skidplate bolt will not hit the bottom.
Chad we will be testing Sunday. Talk to Mike at the collage cann't dyno till the after Pell City. Chad did a couple of runnes in the field had a big smile.
Here is some pics of the header not great pics if the header works I will be making it out of stainless I used what was laying around the shop.