I highly doubt you will get any gain out of a throttle body upgrade as far as horsepower. It will feel like it has better throttle response because it will flow more at a given throttle position similar to the pedalmax, but once you get anywhere near the max airflow of the stock TB there are so many other much worse restrictions that I highly doubt the TB will make a lick of difference. I'd start upgrading things on the cold side of the intake first, then the exhaust, then the charged air pipes, then the turbos, then when you start getting closer to 500+hp, it might be worth upgrading the TB. If it were significantly cheaper, it might be worth is just for the placebo effect of the throttle response, but you should already be able to tweak that with a tune. That's my $.02 anyway.