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Only change the tyres once you've had the 4 wheel tracking checked. On the rears - there's and eccentric bolt for toe-in and out on the lower arm, but I think there's eccentric adjustment on the upper arm too for camber. I'm running Nexen tyres, again a mid range tyre, but have been impressed with them in terms of road handling. That rear coil spring lower mount as mentioned is a weak point. You tend to get 3 years out of them. Relatively cheap in terms of parts, but Audi will want an arm and a leg to replace or choose a reputable independent. It's a bit more complicated with a rear axle with quattro, but doable if you are spanner handy.

Yup that's the same part...that on the b8 model is down low on the front of the engine with the egr solenoid above it...the two of them fail a lot causing over boost alarms and boost actuator position alarm, that's why I bought my own smoke machine so I can test the system myself.

Update: I have replaced the boost pressure valve from the same Audi A4 B9 2.0 TDI. I have done a test drive for about ah hour and the fault has not appeared yet which leads me to believe that the issue has been fixed. Thank you to all that helped.