I have found the rear wing which comes with the Stratus is the best. I use this wing on all the bodies I have, inc' DNA 3, Mazda 6 and natrually the Stratus 3.1
You get more downforce from this wing then the others.
I've recently been running the DNA 3 body with this wing and with the DNA's great front end and turb in capability and the Stratus rear wing on. It really makes a great combination. Makes the car feel very balanced while at the same time still quite aggressive from the steering aspect.
Regards,
British Menace