X3...I'll just say it wouldn't be cheap. With their other shift kits they have to buy a swap part to alter, then send it to the guy buying, get his stock one back, then repeat. So you have a one time overhead.
That scheme works for stage one.
Stage one will include valve body and solenoid modifications that free up horse power and lower heat levels. You can expect increased durability and load capacity along with shorter more positive shifts. Short positive shifts free up horse power and parasitic loss. The ability to decrease friction allows for lower heat transfer, increased durability, and increased load capacity.
But not for Stage Two
Stage two will include a torque converter machined to custom specs provided by the customer. For the street CPE recommends a converter with a 3,000 RPM stall speed. With stage one and two installed one could spray Nitrous Oxide without any worries of transmission problems.
Our TC is cast so they have to swap it with an Altima TC which is machined.
That's as far as they got with my proto. Add in the electrical R&D and it's a pretty big investment for them to do for 3 sales. I notice they haven't made any other shift kits since 2 yrs ago when they put out the Mazda.
To my understanding, I think any transmission wiz should be able to do Stage One for you though. The solenoid valve tweaks didn't cause the ECU fuss. This would bring you shorter more solid shifts but not change WHEN the shift happens. (which is Jeff's major issue.) So you might want to check around locally.