BORLA 400945 Crate Mufflers ATAK 2.5" x 2.5" GM Stock 6.2L LS3Description BORLA 400945 Crate Mufflers ATAK 2. 5" x 2. 5" GM Stock 6. 2L LS3 The CrateMuffler is designed specifically to optimize the sound and power of crate and custom built engines. This muffler is directional, with the outlet identified by the mounting bracket welded to the endcap. It is tuned for the Chevrolet LS3 6. 2L V8 engine family. The directional design delivers the aggressive ATAK sound, tailored for each engine family, and