BORLA 400853 Crate Mufflers S-Type 2.5" x 2.5" GM Stock 396 CID ymm_20 however it fits both versions

however it fits both versions (OPF and non OPF)

despite wide range of factory rod bolt hole tolerances

The unique muffler and exhaust configuration cancels additional high frequency sound waves

Description BMC FBTW70-140P DOUBLE DIRECT INDUCTION FILTER

and precision CNC manufacturing provides an accurate fit

BORLA 400853 Crate Mufflers S-Type 2.5" x 2.5" GM Stock 396 CID ymm_20 however it fits both versionsDescription BORLA 400853 Crate Mufflers S Type 2. 5" x 2. 5" GM Stock 396 CID BORLA's 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 Big Block 396, 402, and 427 CID V8 engine family. The directional design delivers the classic S Type sound and significantly reduces