If some of you are making 25%-30% more power, that's great. My brain is having a hard time getting around that much improvement with having to run the stock throttle bodies, intakes, cams and cam timing, no CC work, etc. Engines are air pumps, and with all the stock intake components, I just don't see that much room for improvement? I would be ecstatic to see that in the Neon, but my brain won't let me believe it until I see it. [/b]
And you are right, but you assume that those things are already the limiting factor. You can get a lot more air than stock into an IT car when you chuck the OEM airbox, air tubes, etc. You can get a lot more out with some good head work and a header (on most cars). You have to build until the TB and MAF/AFM becomes the restriction...and that is different for each and every car.