the mud guards are nice mazda pieces...not rubber flaps...
installed the voltage clamp (o2 signal mod http://www.flyinmiata.com/support/instructions/ecu/O2_signal_modifier.pdf ) what a pain...i did this on my p5, but th ecu and harness is right there in front of you, not over your head in the drivers footwell....installed the turbosmart boost controller...10psi...yummy!
More power than my car...