I have a 2006 WR450 and I think it a wonderful bike. However I race Hare Scrambles in Canada (here we call them EnduroCross) and I believe I would perform better and enjoy myself more on a YZF450 (the white ones are nice ). I would like to modify the YZF to make it more appropriate for trail riding in muddy conditions and riding in tight woods with rocks and roots. What do you recommand? - heavier flywheel: how much heavier (6 oz like the wr)? - closing a bit the holes of the air box? - spark arrestor - hand gards and engine gard: a must What do you think?