I doubt you will see 8800 RPM extra. Like I said, what happens on paper is vastly different to what happens on the ground. I would actually hazard a guess you will start to let the smoke out of things.
If you don't believe, measure max RPM at the wheel with the car off the ground (don't use your actual wheels, because you will probably shred your tyres, use something like a disc with a marker or something so you can measure RPM). Now add another 8800 RPM at the motor and work out what the difference is going to be at the wheel. Convert that to car speed and then try to think if it seems reasonable that it will happen.
Keep in mind that air drag goes up with third power, tranny drag depends on revs (not sure how, but it's for sure worse than linear), and so on. I would say that you already are in the diminishing returns domain right now. A new motor will probably add something insignificant if not straight up burn things.
But you know what they say.
You never know until you try.