Hey Jason...no air filter I'll try that...how is R.A.M.S these days?
What happened to the MRX4X?
Are you running the Evolva M3 nowadays?
I just built my M3 a few weeks ago...and it is very similar to my old Mugen...just picked up a Flash .21, gonna break that in this weekend (hopefully)
Hope to get back to R.A.M.S. again soon (too much work here in S.F.)

Take it easy~