I have Dinan stage 1 in my 07 335 and am very happy with the performance. No oil cooler in my car, nonetheless, it runs 20 degrees cooler. My warranty expired and the car is quite expensive to maintain.
As soon as the new F32 comes out I'll lease one.
If you ask me, leasing is way to go.
Yes you have a car payment, but headache.
Anyway, I recommend Dinan S1!
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