Hi Karl , as Jez says it sounds about right the figures but we have found with tuning the Zeds (350 and 370's) that these cars need around 6 runs to get the power to settle down , normally after 3 or 4 runs the BHP/Torque levels out due to the small amount of self learnt hat the ECU will do during the dyno runs, there is a Dyno plot somewhere on this site by Abbey of multi pulls and the power/torque gain.
We have tuned over 30 370's now including the Sony Playstation Competition cars and F/I 370's we all very good results;
We have found totally stock cars run very rich from the factory so when we remap the car we lean the fueling out which gains MPG and sharpens the throttle response up a lot makes the car drive far better at part throttle as well , within the remap we use the multi maps parts of the UPREV remap to give you different throttle response maps switched by the cruise switch.
We are doing a deal on supply and fit Milltek non resonated system and UPREV remap
370Z Full NON resonated exhau
st system inc Y pipe + Dyno tuned Uprev re-map HKS drop in Panel filters package price £1473.70 inc vat (Manual/Auto)
Dyno plot of your modifications
We hope to have our 1st Miltek system in 2 to 3 weeks.
We can supply an induction system if you require on of these from Stock we use the Ignen long tube system they fit the air filter down in front of the radiator to keep heat soak away from the intake system, they sound lovely thou. if you want a quote on these I can sort this out for you.
Any more questions fire away.