What is the size of the pipe need before and after the MAF? I am considering making a new CAI and I need to know the pipe sizes I need to order. I think they are 4in (before MAF) and 3.5in (After MAF). Thanks..

 

I know people have built 3.5" and 4" systems all the way through, so either will work. Mine is 3.5" all the way through FWIW.

 

you should be able to make it 4" and do a 4"to3.5 coupler at the maf

 

what material are you going to use?

 

I was wanting to use steel pipe.

 

you going to weld it yourself are are you going to cut and use rubber elbows?

 

Yep I am going to weld it. I was planning on reusing the stock rubber bushings/clamps and using a short 4in radius, 4in steel 90* elbow. There is about 5.5 inches betweent he TB and fan shroud. I am trying to make a UPD type lid out of fiberglass and parts of the stock airbox. I have allready smothed and fiberglassed the bottom side of the airbox and cut a HUGE whole in the back side of it.

I just need to know the OD of the TB and OD of each side of the MAF.

 

so is the throttle body opening 4" or is it smaller?

 

I used a 4" elbow if that helps...

 

no way 3" would work huh?