Warning!! IMO alert!!
Any kdx'ers currently considering the rb mod to their carb should consider an airstryker from rb-designs. You'll get the benefit of a ron-finessed carb, newer keihin design, plus you'll still have the oem pwk to either sell, keep as a spare or put back on the bike when you sell it.
Besides, think of all the fun you'll have when your riding buddies are trying to figure out what all them hoses are doin' hanging out everywhere!
If you're a 'pre-' rb/dfII kinda rider, you're in for a huge surprise!
BTW, while the FmF 'rev' pipe may not exist by name, it is still the word that best defines the profile of the pipe, as does the word 'torque'.
I don't know what the word desert realistically implies.....a pipe that only works when it's hot? But then, it gets pretty freezin' dang cold in the deserts 'round here.........;)
A further btw...the dfII was the improvement that allowed me to satisfactorily use the -30 (rev profile) on my 200 in single track woodsy stuff (already had an rb-modified oem pwk). Prior to the dfII, I couldn't get an acceptable bottom-end response out of the -30. An rb-airstryker made it even better!
YeeHAw!!