as above, the car is a 2wd sapphire cos, low comp, 3 bar, 803's, 500 cooler etc. running a t3 which boost's too 22psi. 328bhp before missfire . i've tested the plugs, and i'm pretty confident thats the route of my trouble.

i've heard that 071's at 0.6mm would be best, am i too assume these are available from ford? and is this the best option for me? or i am best just nipping down to demon tweeks and getting shafted by some over priced option?

oppions and advice much needed.