guess ill be the first to reply. well depending on hows you ride and waht you ride. trails i heard fatty and gnarly ( or w.e it is ) from fmf are good, and the sst and rev are for MX. i ride trails so i went with the fatty and fmf shorty silencer. go with reeds and cage. if you want low end, go with the moose intake spacer adapter and the mx bones exhaust spacer. and even go with a big bore for that all aorund power...
my daughter had a '03 cr 85 expert, she raced motocross only. we put on a pro circuit pipe and silencer. i compared dyno results for the various pipes available for it at the time and the pc brought the useable power down in the powerband about 500 rpms and added one horsepower gain. we consulted with a national champion tuner and he suggested the only other mod she needed besides suspension, was the v force 3. that's what we went with and were very pleased with the results.