Nissan Sentra Muffler

I Recently Had My Muffler Replaced Due To Hole/rust. I Had An Aftermarket Muffler Installed As It Was The Cheaper Option. Well Now When I...

Drivers Side Rear Door Area. It Vibrating Sound When I Gas Get A Little Bit Louder. Do I Need Muffler Or What Part Of The Exhaust System?

I Went In For What I Would Have Imagined To Be An Exhaust Pipe Replacement, And The Shop Told Me I Would Need The Muffler-$93.71, Elbow...