A lot of the parts are interchangeable.

I would be seriously tempted to trade in my '09 BMW 535 for a '06- '08 Manual XT .

My 2009 535. A quick Cobb tune or JB4 upgrade and you're close to 375 HP before any other supporting mods. Lot's of people pushing a lot of power out without rebuilding engines or transmissions.

I always thought the windows needed to remain open in a lot of racing series due to safety concerns in regards to exiting the vehicle in an emergency situation. (If I'm wrong then ignore the following question)

Imagine the FX50 with two doors, manual, and a bed!