looking to replace the exhaust system on my 55 Vert with a 327. I was wondering if there is anything to gain by going from 2" Rams Horns to 2.5" Rams Horns? Would there be any clearance issues? Will 2.5" tubing fit though the holes in the frame cross member? I'm also looking at using Magnaflow mufflers and i want to keep it fairly quiet. i would appreciate any advice.