Probably a Turbo change Kev as 380-390 seems to be on the limit.

So with that in mind, blower, Clutch, Turbo back Zorst, pump, map i guess 2.5k+

If you want to settle for 380 then you can save on Turbo and just the above mate tbh as 20bhp want really be felt in the real world.

Mine made 379bhp with similar torque but tbh i'm pushing the Mak turbo to its limits mate. Lol..

PS, watch the rods too kev going for that power..