Car engine very loud. Muffler checked and it is not that. What else could it be? on 2005 Volvo S60

It started a while ago and does it all the time. It does not have the pick up that it used to have. I don't want to hurt the car by driving a lot.

Asked by for the 2005 Volvo S60
1 answer
Are all the spark plugs still in the engine? (Verify visually). Or as most do , lately , post a useless question and don't bother replying. Just keep driving it , I'm sure it is not serious......yet.