^^Pretty much what mine looked liked, but holy cow that is polished lol. Mine wasn't no where near that finish. It helped with throttle response and was free though. But it's no where what a real tb gives, it's more like a medium in response. Quicker stock feeling but not a aftermarket tb feeling ether.
I like the way the stock ported throttle body feels. It costs 3 bucks and takes a half hour to do, and it feels better for a DD than my bbk 65mm tb felt. I hated that piece of shit.
When you open up the stock tb, you will actually tunnel through the plastic and there will be a hole. Epoxy (jbweld) is applied before grinding is started, and it adds more material so you don't bore through it. You'll understand when you hold it in your hand.
I recently did my zx2's TB it's aluminum though. The car seems to have droped by about 150ish RPM's on highway at 70mph. You can also remove the butterfly and cut the shaft down I have pics I have to upload still from my phone. The most naticable diffrence was just smothing it all out the butterfly part made little difference but some.
for a little more cfm you can remove the tps sensor and butterfly. remove the shaft and cut the top of the shaft off. then grind the screws shorter.then reassemble centering the plate and using loctight on the screws. I did this to mine. but found most of the difference from the enlarging the bore very little from the butterfly mod but still some.