i just purchased the speedbuilt fenderwell intake but i didnt recieve it yet and i want to buy a aiy bypass valve. does anyone know the size of the piping.

 

It's prolly 3"

I'd suggest you save your money for a more worthwhile mod. The bypass valve is super overrated. The only way your intake is gonna suck up enough water to make it useful is if the filter was submerged under water for a long period of time while at WOT. If you have that problem, might I suggest a boat?

 

i would just suggest locating your filter in an area that doesnt risk getting saturated in water. if in the fender, your fender covers should do the trick. if not i would use a heat shield to prevent spray.