Borla CrateMuffler Stock SBF 289/ 302/ FE BB 2.5 inch Offset/Offset 14in x 4.35in x 9in Oval Muffler 2011-gmc-sierra-1500-slt-esi9810738 Combining patented technology with computer

Combining patented technology with computer modeling

25" diameter Axle-Back system delivers the classic S-Type sound with no drone inside the vehicle

They will fit vehicles with and WITHOUT NPP

Borla® exhaust systems are covered under our Million-Mile warranty with the following exceptions

Borla CrateMuffler Stock SBF 289/ 302/ FE BB 2.5 inch Offset/Offset 14in x 4.35in x 9in Oval Muffler 2011-gmc-sierra-1500-slt-esi9810738 Combining patented technology with computerBORLA(r)'s CrateMuffler(r) is the world's first muffler purpose built to optimize the sound & power of crate and custom built motors. The mufflers are directional. The outlet can be identified by the mounting bracket welded to the endcap. This muffler is tuned for the Ford Small Block 289 302 (Exc. Coyote 5. 0L) 351W CID V8 & Big Block 390 427 428 460 CID V8 FE Serie engine families. The directional design provides the classic S Type sound and will