honestly.. pipe or pvc... havent really gave it much thought since im really not sure what im doing with my map sensor.. where is yours in the pics.. and if u have one howd you mount it ? and the lil air filter next to the large cone.. im sorta dumb but whats that do for ya when u get rid of the main airbox..

 

i didn't have that on my engine. but if u check out k and n's website they have kits
avaliable w/ bungs in the side of the pipe for sensors. just copy them w/ a piece of pipe and silicone it in there. i know other ppl here have done that.

the little filter is a breather. it replaced the breather tube that went to my old airbox. in the picture it connects to pipes that then go into each side of the engine.