Borla electronic charger mufflers, middle mufflers removed. The sound is nice when driving, loud when accelerating, and gives a gunshot-like sound when shifting gears. When the mufflers are closed, it doesn't cause backfire on the engine. The mufflers have a different system than the cheap market ones. The kit has been used for less than 6 months. The device is in good condition and comes with two keys. The kit is 2.5 inches.