BRAMMER

iTrader: (23)

As title what are these all about?? are they worth getting?

Markb_s1

depends on the power level you're running from what i understand

pa_sjo

They increase the volume of the plenum.. not really necessary unless you're looking for 500hp (but then the elbow on the manifold is more a concern than the plenum volume!).

ballbag42

iTrader: (2)

the ones ive seen on advertised inc the plenum capacity but we sell some composite ones that go in between the manifold and the head which decreases the temp of the inlet manifold because there is no heat transfer through the spacer which with turbo cars as you know the cooler they run the better ,we have tested these for 4 years now in the ford saloon car championship with good results,see my ad on parts for sale