Apexi AFC? Find a link and post of picture of what it looks like.
No, those were my actual car / real rear wheel dyno numbers not factory #s 
460hp sounds more like where it should be, if not more. Was the AFC in your car when you bought it?
The dynos are the confusing part. Went through a whole discussion on tt.net. AF controller and everything else is just the way it was when I bought it. Not casting any dispersions on your ride.
While no 2 dyno’s are going to put out exactly the same numbers, loosing almost 80hp from one to another is a lot IMO. Try to get the AFR info for those pulls from Mike if he had it hooked up to the wideband.
Are you using this to control the fuel in your engine?
Very similar, knob and dial configuration though. I think you’re showing a slightly newer model.
IMO for the mods you have listed you should be tuning with something that has much more capability. You cannot change timing with an AFC, it only modifies the timing curve based on cheating the MAF signal. Timing is crucial in a turbo car. Get an AEM EMS or a custom tuned chip from one of the people listed by onyx
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I am sure the Z community has way better options than that.
Greg D. & Specialty Z definitely know what they’re doing, but I’m :tif: on that AFC.
You also have a dual MAF setup on you mods list. I’d be interested to see how that AFC is setup / wired to handle both signals. Unless you’re ECU is socketed & chipped as well, but you still need to take a look for us.
Dual MAF / dual intake isn’t totally necessary until > 500hp. And 740cc injectors are used for > 500hp as well. Your car has the parts to put down higher power but it’s not. If the point of building this car (by the previous owner) was to only put down ~400hp then he went overkill on the injector size / intake.
Sounds like the car needs to be sorted out, have boost leaks checked for, and then t00ned by a professional on some kind of quality tuning software. Good luck 