I'm planning this install (have purchased a 2009 system less mufflers). Apparently I will also need a new pan (oil or tranny?) and modification of the hangers. My Classic has the factory Stage 1. Has anyone here done this modification? Any tips? Will my Screamin' Eagle mufflers work, or will I need to recore 1 or both? I know this isn't a popular modification, but I love the looks of the factory 2-1-2 and the fact there is a subsequent heat reduction.