are these worth fitting do they increase bhp i'm geting a live map soon so i want to do a easy mod!!! which spacer is the best size? cheers

 

shlould be a bit more responsive mate that all

 

How exactly does increasing the plenum volume make it more responsive?

 

dont know the science behind it but it worked on mine

 

iv had 2 made 1 for my mate escort and 1 for my 3dr we have put the 1 on the escort and my mate said it feals a lot smoother . i would say they do work as when you stip the manifold down you can see that theres not that mush room inside for the air to get into the trumpits so the more room you give them has got to help the air flow.

The photos are of a 2wd inlet but im putting a 4x4 on my 3dr as they are bigger inside and have better flow frow the neck