I have an 07 335 with Dinan S 1 and am very happy with the performance.
Also, it runs 20 degrees cooler with no oil cooler.
The warranty expired it is proofs to be quite costly to maintain. As soon the new F32 comes out, I'll lease again.
If you ask me, leasing is the way to go.
Anyway, I can only recommend Dinan S1.
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