The turbo again is an unknown entity to me personally but as an example, myself and many others have old T3's running this level for fun and still going strong.. its 24+maintained that destroys them as a rule

If you were to buy the kit from me you would be looking at:
Stg 2 Evochip "Closed loop" Software: £250
4x greens £208
1x 3bar £75
1x -31 act £65
Delivery £8
Total: £606

Or £565 as a package delivered before 1pm tomorrow.
You will have local fitting and checking on top, or a variation of this price if you buy it all direct from AP Tuning. Gary may even be slightly cheaper, you never know till you try.