Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great upgrade

Got this muffler as a replacement for the factory "trash can" on my 2007 Chevy Silverado. Made a tremendous difference. Don't be fooled, it is loud, basically a straight pipe, but it makes you legal if state law requires a muffler. I paired mine with a 4" in/6" out Pypes tip and it sounds amazing.PROS: No break in period, loud right out of the box, makes you legal, great price, easy install, sounds greatCONS: very loud (if that's not what your looking for), other than that nothing.