I plan on doing this conversion on my 02 YZ426F. I'm planning on buying new exhaust anyway, most likely FMF Q4 muffler and Powerbomb header. Would it be better to buy the muffler and header for a YZ450F? Less likely to have clearance issues with the subframe and rear shock? Will the conversion work with an aftermarket desert tank? Most likely getting a YZ450F Acerbis tank.