On Sale Add to Cart 11" Muffler For Peterbilt 387 M110824 GrandRock MSRP: $359.79 Now: $316.62 Was: 11" Muffler For Peterbilt 387 *Please Verify OEM Number Before Purchase Muffler Fits Peterbilt 387 Models Not Equipped With DPF (2002-2007) 11" Body Diameter 5" I.D. Inlet Diameter 5" I.D. Outlet Diameter Shell Length: 55" Overall Length: 61.5"... MSRP: $359.79 Now: $316.62 Was: Add to Cart