There is no restriction there if it's properly made... I've made dozens of intakes that way,and the "slit" between the feeder tank and the plenum itself has the same area as (or slightly larger than) the piping from the IC. It just redistributes,it doesn't restrict,even though it seems to do so at first glance.JustinOlson wrote: Personally I think that any gain see from better distrubition will be lost to the more surface area and restriction. What are your guys thoughts?
In my opinion,only if you have a distribution problem without them and/or if you need them to get proper tuning (correct intake runner lenght). I've tried making funnels in the base plate for the intake (i.e. no velocity stack at all) and just like in this photo,and any disadvantages with the one or the other was most times traced to making the intake runner too short or too long for the rpm used...Does raising the velocity stack off of the plenum floor have a large impact on power?