Well after a hour or so of reading on here I decided it was time to drill out my stock pipes. Got out the hole saw and went and bought a 12 inch 1/2 drill bit. Success the back plate was easy and put three holes in the back one. Sounds great but I really wanted to go for a fourth but I do like where it's at. Went and rode for about a hour no popping backfire or anything, I was a little worried about that but all is well loving this site!!!