I had the Bluefin with my BMW 335d. Easy to use, didn't get the power it advertised (320 BHP vs 345 BHP). But, by all accounts, many others I know who have used them have gotten their stated figures.
That said, I was happy enough. 320 BHP and 38 mpg was a good deal.
Actually had bluefin for the 2.0TFSi quattro developed on my old car. Absolutely loved it. Well worth it in my opinion and certainly made it go faster!! Didn't see much improvement in fuel economy but gave me a big smile!!
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