Doesn't look too terribly inflated honestly. Always nice to see your starting point. Even if you end up getting tuned on a different dyno you can always revisit these guys to measure the difference from when you started.
You can see here a g37s we tuned a while back with just a catback exhaust. We picked up about 15hp over the baseline if I remember correctly.
Link:
Motion Lab Tuned 2009 G37S Some N/A love 298WHP/240WTQ
These cars make great power on the factory mapping and can be difficult to get any substantial results out of tuning with basic bolt on upgrades. Congrats on the power!
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com