The majority of transmission issues on the 4.6is are caused by a slipping torque converter, at least the torque converter can be replaced (2000USD) and doesn't require an entire transmission to be replaced, however there's a lot of labor involved.
You may just see the problem sooner on a 4.6is if it's driven hard. I've seen torque converters being replaced at 14k miles ....

The Dinan software will not cause the problem(s) to be accelerated , I've been through this with Dinan and BMW NA in the past.

If you have Dinan transmission (or engine) sw installed BMW NA will give you a hard time and usually tell you to take the issue up with Dinan (from this point onwards you better have a good relationship with your BMW/Dinan dealer as you're at their mercy) .

- Jan

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National Rental Cars....