i want to get the best i can out of the spec i have now got-the engine is a 200 long studded,low comp,cometic gasket,knife edged crank,head ported to wrc spec,bd14 cams,double valve springs,bronze guides.

would i be better to use the rs500 manifold with 4 greys or 8 greens to achive say 420-450 bhp with the t4?which ecu would be best for the job-l8?