Hey mate, Had the supporting mods like 550cc injectors, 040 pump, FPR, Power FC, full 3'' exhaust with "high flow" cat and trust cat back, Car also has R33 GTR engine. With the -5 you should get around 330-340. I chose the -7 as I wanted really good response with minimal lag, at the moment it feels like the -7 spool at the same speed the stock turbo's were.
Ryan