Wow! 2 year old thread resurrected!
I still have my DF-03 MS. Hardly used.
3-racing do a hop-up kit, but I just purchased this one a few weeks ago:
http://kmrcshop.com/products/DIK%252...rtion-Kit.html
Grab it while you can! The 3 racing one is hard to find. Stella models had a few going which have done now..