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Originally Posted by //TMT
I'll be interested to learn what connections it makes to the engine sensors. Their video indicates that generally they intercept the fuel pressure and manifold pressure sensors, and that "some vehicles" are different.
This type of approach is nice in that it's completely external, and reversible. I'll be super-interested to know if it truly achieves 20% like the promo material swoons about. It seems unrealistic, and maybe risky. In some cars, maybe, but the M35i is fairly highly tuned already.
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Just remember the figures quoted are for that engine. BMW are typically conservative with their production power level figures, so I would expect more than the 20% gain as advertised.
If they (Tdi) say it does, then it will. In the UK, we can challenge them through trading standards if they fall short.