Actually I would expect that our dual throttle bodies are much better than a 90mm throttle body. A 90mm (3.5 inch) throttle body opened 35% will let a lot more air through than dual 63mm (2.5 inch) throttle bodies will at 35%. This means you get a more linear throttle application with the duals than you would the single.
To bad we have a crappy idle control valve that is expensive as heck to replace.
