Ok, I am upgrading my exhayst system. What I have found is that I can get a 5" mandrel bent system(down pipe, extension pipe(one between down pipe and muffler, muffler and tailpipe, all hangers, 14ga. aluminized steel) for the same price I can get the 4" system(approx $370. 00). Should I go w/the 5" or stay w/the 4"? Has anyone experienced fitting problems? Or will most of these mandrel bent systems bolt right up? As always you guys/gals give the best info, thats why I always ask here first. Thanks a bunch. Rattle on Everyone!!!!