I did the numbers one nite and came up with a 15% gain from the 52mm throttle body over the stock 46mm size, 15% more room for air to move through

I didn't think 15% was alot but think of it this way, you buy a certain part for your car that states that it will give you a 15% gain of horsepower, Now I think our cars range between 119-122 whp, so a 15% hp gain would range us between 137-140whp, that is a nice gain

or even think of the straw example stated above, its kind of exaggerated in my way of explaining it but take one of those tiny red coffee straws you use to stir coffee, and suck through it, its hard as hell, now go and get you one of those jumbo straws they give for slurpees and slushies and suck through it, gives you more of an example

if my numbers seem off or wrong, put me in my place