What is your question?
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What is your question?
Sounds like a hole in the muffler. Mostly from front, driver's side of car. Is it necessary to 100% replace the whole system, or just where the problem is?? Noisiest on start up; as engine idles down, noise reduces 50%.
What makes this problem better or worse?
It's worse when engine is cold; doesn't seem to affect performance; gas mileage is worse
How long has your 2009 Audi Q7 had this problem?
several months - car isn't used that much. Noise has grown worse over 2,000 mile period, or 8 months