Are there any aftermarket intake manifolds available for 4 or 6 port engines while still keeping an EFI setup? Or is everyone stuck with producing their own? Redline performance says they have one, but i've never heard of them before and there is no pcture. As well as some transmission company but they give no price, so i'm skeptical of either of those solutions.

 

check out this link http://kgparts.com/index.php?page=jaytech

 

You can use a Webber flanged manifold and run some Webber style ITB's. That's one option. Other than that and the other one mentionned there's nothing that I'm aware of other than custom ones.