Thanks for the info, theres so much more to think about when you go from a stage 3 upwards.
Spoke to the people at Julian Godfreys yesterday, and they recommended an S60 turbo. Not familiar with this one, anybody else heard of it? To be honest, it'll probably be the summer before I have saved up for the turbo and new management system, so I'll only be running 420 bhp until then. In that time I should be a bloody expert on turbos and management systems, I'll be finding out as much as I can
What I do know is that once everything is in place, I'll be back at the POD, and looking for any track days around the south, so I'll be keeping my eyes on the site for more info.
Keep the info and opinions coming guys, all much appreciated.
Matt.