Lately when I stand at the rear of my car I can hear the exhaust kind of rumbling almost like I have an after market exhaust but not as loud.maybe I didn't notice it before .should I be able to clearly hear my exhaust when standing at the rear of the car? I feel like it isn't normal cause I had my car idling for a few minutes after a 30 minute drive, I could hear the exhaust then after a few minutes of idle the engine got quieter like the rpm dropped (but I don't think the rpm actually dropped) then I walked behind the car I couldn't hear the exhaust at all.
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