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I'll agree with the VERY SLIGHT throttle response. The reason is this: If you have one butterfly valve that's 3" diameter and one that's 1" diameter, and both are open the same angle, the 3" valve will flow more. So yes, it basically means you don't have to push the pedal as far to get the same "response" as with a smallet TB.
However, 40% more flow is simply not true. Half a second off a 0-60 time is also not true. It doesn't take half a second to push the pedal to the floor, no matter how far you have to push it. A few degrees in ambient temperature will make more difference than this. The TB is NOT the bottleneck of the intake system. The difference in the TB's is about .290" on the diameter, if I remember correctly.
The plenum is the big bottleneck of the system on a z31. The second worst is the heads.
And $250 for one of thest throttle bodies is an absolute scam!! People should be ashamed to sell for that much..but if somebody's STUPID enough to pay that for it, they've got to have a mental impairment. (BTW, Crowbar doesn't sell for near that money, so if you want one, skip the link above and get with him for one.)
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