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The ones in the states I've read about all add a 2nd injector pulse at 20-30% of the primary signal. Some have a dial you can tweak your settings that would change that % but don't think it makes any real difference, when in closed loop the O2 sensors going to do it's thing, the car just doesn't know about the 2nd pulse. $300 for 4 cylinder models.
Ebay has them under $40 from china and some more expensive ones made in Europe.
You can get the same thing done with 20% larger injectors.
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