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I got EU X1 2.3D (ZF 6HP) and I have been using XHP Stage 1 (max stage for 2.3d) for about 8 months now.
The difference is very noticeable, better shift points and a lot better response when starting from 1st or 2nd gear. Also huge improvements in manual mode shifting - a lot quicker. Definitely worth the money.
Though take note guys, it will put little bit more stress to your transmission and torque converter. Something to think about, if your car is already with high mileage.
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