if I buy this for the ttr first will it fit? Mines a 1994 and second will I have to bother with jetting as don't want to mess with it - I just want a slip on system http://www.ebay.co.uk/itm/FMF-PowerCore-4-exhaust-muffler-silencer-Yamaha-TTR250-1999-2006-/230784787080?pt=Motorcycles_Parts_Accessories&hash=item35bbd86288#ht_1751wt_690
or this looks good for price http://www.ebay.co.uk/itm/DG-R-Series-Slip-On-Exhaust-Yamaha-TT-R250-dg-02-4250-/200592291696?pt=Motorcycles_Parts_Accessories&hash=item2eb43b7770#ht_5086wt_1208