Power wise, once my controller is fitted (Car is SORN'd ATM) i should be knocking on the door of 335 brake at 22psi I reckon.
If your gonna get a Manifold, then either go for Primary Designs, GGR or JEK.
Blueflame are naff and so are Nortech.

A Manifold is brilliant for torque increase. Really feel the difference.