1. The exhaust on my car is noisy. Can i take my test in a car with a noisy exhaust?
If there is a fault with your exhaust it may be that the examiner will refuse to carry out the test. However, if it is just a noisy exhaust set up that has passed the mot test then you are probably ok

2. I failed my test and don't want the same examiner for my next test. canI ask for a different examiner?
There is no provision to ask for a different examiner on your test