Originally posted by MaxVO2
I had this problem as well on my setup. The 4 inch pipe did not allow the up pipe to come together properly. I have a stock location intercooler though, not a front mount.
If it's not a HUGE discrepancy you can do what I did. I ended up having to use a slightly longer Silicone hose to the throttle body and up-pipe, along with gently flattening the MAF pipe a very little bit on the top with a auto body mini-anvil on the inside of the MAF pipe, and tapping on it until enough space was made. The MAF pipe is aluminum so it was very easy to do. Don't just bang on it with a hammer - put something inside the pipe itself to limit the depth if you only need to make a very mild correction.
If it's really far off, a plenum spacer will definitely work. I have an extra phenolic resin spacer that I was thinking of using, but didn't want it to possibly upset the flow of the RJC power plate I have on my car by increasing plenum volume above it. The spacer I was going to use was 1/2 inch thick. I bought the spacer from a vendor years ago, and took it off when I got my RJC plate.
Hope this helps
Billy
Montgomery Village, MD