The tuner couldn't get any more boost out of mine. That's where I'd be interested in seeing what Steve's boost looked like and if his power is coming from boost or other areas like timing. Timing can get you some additional gains, but most tuners don't try to push it because it's the least safe method of gaining power. I'm running 92 octane Kwik Trip gas, and my tuner didn't see much for problems with it.
Also, something I've noticed with mine. My BOV never really blows off. What that means is that my engine is gobbling up whatever boost I make, thus there's no restriction after the turbo (intake, engine, exhaust) that is causing the engine to not flow as much air as my turbo is producing. This would suggest that if I have any significant remaining restriction it would be pre-turbo, such as the inlet or airbox. Given Steve is running a stock air box and just an inlet upgrade, I'm still thinking there might be some restriction with the inlet.