did some searching already and what i've come up with so far is that the main use for the popular manifold spacers are to block off the coolant passage. this to keep the manifold cooler and help reduce intake air temp.
what i want to know is the effect of the added length. theory is that longer intake runners increases intake air velocity. more air in less time. better low end tq.
can we get anyone to confirm this? anyone did any research dyno testing with different intake runner lengths?
anybody out there with both the manifold spacer and TB spacer? dyno #"s? gains? loss?

 

I'm interested in this, the spacer is all the rage in the 350Z, my buddy through down another 11hp with it...

 

No gains in low end trq with the Hondata IMG, its just for keeping the IM cooler.

 

then again with the 350z you have that wonderfully designed U after the throttle body which adding this mod may assist in proper cyl filling perhaps.

 

yeah. my brother got the same thing. and hes giving me crap cause the S doesnt take well to simple mods as the Z does.