Add to Cart Peterbilt 357 378 5" Aluminized Y Pipe 14-15500 14-13965 GrandRock MSRP: Now: $969.95 Was: Peterbilt 357 378 5" Aluminized Y Pipe 14-15500 14-13965 *Please Verify Your OEM Number Before Purchase Heavy Duty Aluminized Y Pipe First Peterbilt 357 And 378 Models Direct Aftermarket Replacement For OEM #s: 14-15500, 14-13965 OD/OD/ID 5... MSRP: Now: $969.95 Was: Add to Cart