Andrew at Pro Automotive is very good and cannot recommend enough. He will provide a safe tune that you do not need to worry about.
Pro Automotive, R32 GT-R VS-II (2005)
MODS: Exhaust, N1 Turbos, Nismo fuel reg, K&N panel filter, 95RON PULP
Power Figure: 255rwkw @ 16psi (Dyno Logic)
ECU: Mines VX-Rom
Service: Excellent
Car Performance: Consistant fifth position on most stages at Rallye Burnie that year
Pro Automotive, R32 GTS-t (2004)
MODS: Exhaust, FMIC, 98RON PULP
Power Figure: 177rwkw @ 17psi (Dyno Logic)
ECU: Unichip
Service: Excellent
Car performance: low 62s at Symmons
Howell Automotive, S14 (2003)
MODS: Exhaust, HKS pod filter, fuel reg, 95RON PULP
Power Figure: 180rwkw @ 17psi (Dyno Dynamics), but struggled to show more than 150 on Pro Automotive Dyno Logic dyno
ECU: Unichip
Service: Excellent
Car performance: low 63s at Basky