Hey Cecil, I have a 2010 fatboy lo 96 with the stage 1 big breather and race tuner. I currently have the V&H 2 into 2 big radius. My buddy is trying to talk me into boring out my heads and doing this 27544-10A upgrade and a pro pipe 2 into 1. What are your thoughts, and how much will I sacrifice if I stay with the 2 into 2 and not spring for the pro pipe exhaust? Also, will my stock suspension be ok with this modification? Thanks and looking forward to hearing from ya.