Why is my new Focus exhaust so noisy?

I've just had a new exhaust system fitted to my 2004 Ford Focus. The new exhaust makes a loud noise (like a turbo exhaust) when changing gear from 2nd to 3rd and also when I go round corners makes a knocking/creaking noise. I'm wondering if this is normal?

Asked on 15 May 2015 by R_M_K

Answered by Honest John
If it is an aftermarket (cheap) exhaust it will not be the same internally as a Ford OEM exhaust and that might explain the sound difference. But still important to get it checked for any leaks that might be causing the noise.
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