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There is a very long thread on Dinan in the 1 series forum. After reviewing and comparing dyno charts for both Dinan and BMW's PPK 1, I came away unconvinced that Dinan was any better. The BMW PPK is no fuss no muss. The warranty is not affected and extended warranties are available. It is $1,000 less than Dinan. I am very happy with the PPK1.
If you want the maximum power per dollar, get a JB4 and hope for the best as far as the warranty goes. I have had some communications with forum members who get great results from the JB4 but further mods (down pipe, FMIC, exhaust, intake) caused problems. That is not to say that these items do not work. It appears there is more involved than just bolting things on.
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