The engine mounting was changed to shift the engine down in front in later years. The rear pipe mount was also changed in later years so you would need to look at modifying or buying the rear pipe mount.
It will take some work to make it fit as the alignment is different.
Yes the FMF is the worst fitting pipe of all, but they will work on every year almost. I know the 06 OEM Gasgas pipe will fit on my 2002 so unless 2002 tthey changed then it would fit with some tweaking.