Originally Posted by ceballos
for a slip on, FMF provides a "slip flange" for your stock header, right?... all you have to do is take that off and it will fit with the FMF header... They were made that way for a reason...
That is all you have to do. Matches right up. If it didn't, that would be pretty gay lol. I'd go w/ a Uni as well, and you can mod the lid if you want but don't really need to IMO.
2008 700xx; Power Bomb header with power core 4 exhaust, Power Programmer III, pro armor nerfs, prm products control front and rear bumpers and full skid, 10" ITP rears, ITP Baja's fronts, RZR 2's all the way around, Uni filter, 13t sprocket, CCP steering Damper, DS450 shock swap, Dual Gasser Throttle, bar risers and Moose barkBusters. 730XX kit plus other engine mods!