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I installed the stage 2 today and running on 97 octane fuel. The performance difference vs stock is incredible . The major change is in the 80-120 time, feels like the car does that in like split seconds!
This tune has made the car like a beast . I am going to drag another same spec firends stock z4 and will try to take some videos to record the difference
And also should get some dyno test done soon.
To sum up , huge difference in performance vs stock , a must buy! And I am sure now all owners who have had the car for 1+ year will love this change since it's as good as getting a brand new car which is much faster than the one you are used to.
S
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