No harm (except the high probability of going backwards), you can do whatever you want for the 'f**k' of it, that is not what i'm saying. Have your play, just don't expect to see much in the way of gains....lots of effort and dollars that are better directed elsewhere if you are looking for a performance increase is all.
Rivamaster, sorry mate but 700 extra rpm from only a throttle body change is total bulls**t, the guy is having you on. Cams are the big flow limiter, followed by the heads...throttle body won't impact rpm limit until those two aspects are changed, if at all. My dyno plot profile hasn't changed from 255rwkw thru to 388+rwkw ie no extra rpm was achieved even though total flow has increased massively.....
Snappier is believeable, as i said previously the proportionally larger change in flow with smaller throttle movement...not always a good thing as can make the car harder to balance. Good ECU and good tuner, may be worth the effort? Can't see it myself having thrown my car around the track quite a bit...throttle response is good even compared to n/a so not an area i'm looking to modify.
Save your pennies for something worthwhile..... or not. What's that saying about leading a horse to water??