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I should imagine the 'down side' is fewer mpg - using more diesel for increased acceleration.

Manufacturers set the ecu to meet emissions tests; give good mpg; give good power - for good read 'acceptable' to the majority of those who are likely to buy the car.

If you improve one of them - the others will suffer - it's the old story you don't get owt for nowt.

The most important thing is that you're happy with the change - that's what really matters. :thumb:
 
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