hey guys i have a blox spacer, i was gona get a tune soon, so i was wondering if this really provides real gains. i havent seen any dyno on this. i have heard that it gives gains in the upper rpm only. i was thinking of swapping the motordyne one with the blox. what should i do?

a spacer is a spacer.

^^ is that really true? cause the Blox is like $90 where as the motordyne is $200

tell me how a machine piece of metal will be different for another machine piece of metal? The both have the be the exact same shape to fit the manifold. Only difference is height, which is trivial at best between the spacers. The motordyne is more bc it comes with a coolant bypass and a isothermal lower plenum gasket.