Is it really worth it to buy a plenum spacer? and how hard is it to install.

 

If you are looking for additional HP, then yes, a plenum spacer is not only effective, but also cost effective.

And they are quite easy to install. Just open up the plenum like a clam shell and slide in the spacer. If you do the Iso Thermal kit you would also have to switch out a lower gasket, but its not hard.

A spacer will typically yeild anywhere between 8-13 HP.
Tony