Im currently building a focus rs engine for my mk5 escort project

I got a engine from pumaspeed and ive got hold of a Turbonetics GTk650 turbo for a steal of ebay

Im thinking of getting the engine bored to 2.1 low comp pistons new rods ballenced crank ported and polished head with cams etc 4branch manifold etc

but im wondering whats the best inlet manifold i should go for around the 500-700 bhp mark?

Also what gearbox should i use? i can source a focus rs box easily but id like to use a mtx 75 with a new diff so i can used the exsiting mounts in my mk5

also going to be running water injection also

basicly i just want to discuss the best parts to use in my engine build. if anyone has anything for sale that might be of use let me know

matty