Quote Originally Posted by tom91ita View Post
but yes, sequential injection > dual point injection > carbs.
16V > 12V > 8V.
OBDx > vacuum advance.
I'm just starting to read today and haven't read the whole thread, but I've gotta disagree with the concept expressed here. Yes, it's true that new technology tends to make more horsepower than old technology. But that difference is already built into the stock hp of the car.

The question is -- what kind of technology differences cause one car to gain X% in IT trim, while another gains Y%?

It's things like restrictive exhausts (which can be changed out). It's not inherently true that a 4V engine will gain more in IT trim than a 2V engine. Unfortunately, manufacturers don't publicize that their cars have restrictive exhausts, so it's very hard to predict how an IT build will affect horsepower, and I just don't buy that newer, higher-tech engines will gain more. In fact, I think in most cases they are likely to gain LESS.