I personally found it a simpler install than the factory unit. Just bolt the carbon bellmouth to the Tam's pipe ( mine had predrilled holes in the pipe with 2 retaining straps ), mount the bellmouth to the former as per manual with the supplied "L" brackets and then use some wood blocks attached to the rear former that center the pipe in the tail cone. The outer part of the pipe is almost flush with the tail cone. I was really impressed with the fit actually.