i bought an under tunnel exhaust and boss seat back in november for my 07 apex se, and got it all installed and it seemed to be working great , loved new throttle response. Now that ther is lots of POWDER it feels like its occasionaly "stuffing up and cutting out" on me. The shop I bought the exhaust from said it needs more air under the hood and maybe an airbox mod and that i should put a vent kit on. They claim it will flow more air and not cut out. Is this true? I have no clue. The vent kit is 360 bucks so its not cheap. would have been nice to know up front.