Q: Definately coming from the exhaust system

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Nissan altima coupe 3.5, aftermarket exhaust and straight pipe. Recently when I'm driving I hear that the exhaust sound louder in the car than before, like there is a hole. I also smell something when I stand next to the tailpipe after I turn the car off. To me it doesn't smell like rotten eggs, just a fume. When I'm driving and the engine is revving at 2-3 rpms it sounds like a motor boat revving, except not as loud. Not sure what this is or where to go for reasonable inspection and repair.

My car has 90000 miles.
My car has a manual transmission.

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