I know gibson to be decent at least in material quality. Cant comment on sound. The thing is most of these companies produce a product in blueprint theory only, then have it made in china in bulk. The "stainless" steel is paper thin 24 gauge polished "steel" that looks awesome online but rusts instantly and falls apart like toilet paper. For legal reasons I cant name names but our shop was once hired to repair 1200 high end exhaust systems made in china that were all crooked. After paying us labor fees of $120 an hour, the company still made money on those garbage exhaust systems... That's how dirt cheap these piles of crap are from china
Mufflers are not rocket science, well... I mean they sort of a are. But dont buy crap just to make your truck sound "neat". Buy quality. You have a 2.5... Itll never be fast, just make it last long.