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I'm a bit late to the party here, but there's 3 restrictions:
  • Throttle plate
    • You can file this down to the correct size (I'll measure it at some point) or there's a $30 part you can get on ebay to replace it.
  • Intake runner diameter
    • These are annoying to get out but can be fixed with a craft knife or replacing them. I haven't done the math to figure out what the correct diameter or length should be.
  • Engine capacity
    • If you REALLY want to fix this you could do, but you're looking at a lot of money and effort.
The fuel/ignition maps in the ECU are the same as the HO version but the throttle plate restricts you to 66.667% throttle opening.
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