You're an idiot. Period.
The "difference" you feel is your car running lean with the timing too far advanced, because your ECU is trying to run your 1.8 liter engine like it's a high-revving 1.6 liter. It's similar to those crap E-Bay "performance" chips that mess with your fuel and timing. Yeah, you might feel a bit of a difference, but at the same time, you could very well be fucking up your motor.
Honda ECUs aren't magical, you can't just throw one from a higher-performance engine into your car and expect it to perform like that engine. The correct solution is to use the computer that came with your engine and augment it with a piggyback device, or chip an ECU and have it custom-tuned to your engine setup.
But whatever man, I'm just an idiot. You obviously know what you're doing. You keep on revving that P30-equipped LS past it's redline and see what happens...
I'm checking out of this thread...it makes my head hurt...