The only Modifications I have planned are new shoes (Eagle F1) and am expecting to replace the rear engine mount. My research tells me the rubber used in the factory mount was a little soft and is best replaced with a mount which uses polyurethane instead. This was definitely true in the earlier models, but as mine is a '04 model it may have been sorted already. Not to mention that the previous owner was meticulous, he also may have already sorted it. Other than that, I will be very happy with the stock model.
Cheers,
Hideo