replaced the stingers last night, first impressions, louder, meaner than stingers, some popping. reminds me of 1 chambers i had on my 03 gt. install was easy, however both sides are crooked as all hell, ive 3 axlebacks, violators, stingers and imcos and they all lined up crooked. the stock muffs line up dead center. drone is present but different than stinger, still loud but doesnt hurt my ears.