I am thinking about installing Vance $ Hines Big Radius 2 into 2 pipes on my wife's 2003 Night Train FXSTB. 88 inch motor. Carbureted. The bike already has Screaming Eagle 2 into 2 exhaust. I know that with fuel injected models I would need to install a fuel management system such as a fuel pak. Since hers is carbureted, will I still need to install a fuel pak and O-2 sensor? This is my weak area, but I am thinking that with carbs, just adjusting and maybe re-jetting will do? Or am I way off here? Thank you in advance.