Dear,
Thanks for contacting us and apologize for the late response.
1.Yes, this radio is compatible with steering wheel controls, you will not lose steering wheel functionality.
2.Generally we don't suggest the customer to upgrade the unit,because the system will be chaotic,and some functions may be not available.
3.This unit will fit your car perfectly.
Instant payments are very important; the earlier you pay, the sooner you will get the item.
Please feel free to contact us, we are always at your service.
Looking forward to your purchase.
Have a nice day.
по
Seicane