I cant see myself doing SEB4 ever again, I made it through the 200BHP barrier on my GT1 but at a huge cost, I admit the thing was an absolute animal in a straight line and the only reason i did it was because i had a brand new cylinder head and completely rebuilt bottom end with bigger pistons it seemed a shame to waste all the hard work
You have to take into consideration costs and reliability:-
Turbo £600 - £950
Chip £135
Pump £100
FMIC £75
FSE £100
Injectors £125 +
Just that alone is nigh on 1500 boys plus all your hoses and sundries.
Or SEB 2
Chip
EBC
Exhaust
Job done