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I had my '06 Si done, well i took it in for an oil change and after the guy's at honda told me that they also did the update..... i would have to say the responsiveness of my SI has been noticeable, seems to work like it should..... I haven't noticed much in the way of fuel economy gain..... I mean i was getting 30 mpg before and after..... but i would say there might have been at most a .2 mpg gain.... Not saying others wouldn't gain mpg....
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