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That is great you have a larger pool to choose from. The N74 variant is also on the Rolls Royce, but... not exactly the same beast.
So, on tuners, these days I find them all to be lame when it comes to providing performance data. When I was tuning Nissan 300ZXs for a living, you NEVER bought anything from Anyone (tune, intake or exhaust, and more) unless they showed you a dyno sheet.
Nowadays, we have Dragy and others, it is easier than ever, and these lame dips don't provide a lick of proof of any performance gains. Not sure how they expect to stay in business. That is the way it is for the i8 and the M760i, at least. In the Jag world, most do provide charts.
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