With regards to the keys, best thing you could do is fine a car with two working keys breaking for spares. Take the ECU, code box, keys, alarm module & receiver and fit them all to your car. You'd need to get an extra blade cut by a key cutter. But it'd just need fitting, and then it would work.
I was breaking a 2.5 V6 but the remote locking didn't work, which is a shame.
Exhaust is likely to be an exhaust leak, if you can get under the car safely with the engine running, and get a mate to block the tailpipe with his hand wrapped in an old towel or something, after a few seconds the pressure will build up and you should see where the gasses are leaking from. My guess is that its somewhere in the engine bay for you to be smelling it inside the car.
Speedo is driven by the ABS module. It could be a dodgy speedo, dodgy ABS module, or a wiring issue.
Side mirrors - take the mirror and brakcet off the car as one unit, split the mirror from the bracket (Torx bits), and then if you look inside the mirror casing you will see a single self tapper (Phillips head), this needs tightening up, it is what holds the plastic casing to the aluminium bracket that holds the glass.
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