With advances in mapping, what is now considered the route to go, I am at the stage now where I was about to go to greys and low comp, but have read a few posts with people claiming serious bhp with high comp engines. Wondered what was the easiest (and cheapest) route to go and what sort of effect on reliability each route have.

Current spec is:
T4
Rs500 intercooler (not yet fitted)
2WD manifold (not yet fitted)
Bayjoo stage 2 chip and B/board
Grp A fuel pump
3 bar
scorpion exhaust
Dark greens

Any advice would be appreciated