How many of you guys run your quads with no air box lid? And if you do, what kind of protection do you use? Do you use a prefilter (how much does one of those cost) or what. I just put a pipe on my 400EX and re-jetted it to a stage 2 jetting. Stage 2 means no airbox lid and a #170 main jet. It is a huge jet and without the airbox lid my bike is SCARY FAST, I mean real fast but once I put the lid back on it sputters and boggs badley. Do you think it is safe to run without the lid?