Grand Rock - Peterbilt 359, 377, 378, or 379 Exhaust Y-Pipes Style:Peterbilt 359 - 5 inch OD (outer dimension) Inlet Upgrade the look of your

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Grand Rock - Peterbilt 359, 377, 378, or 379 Exhaust Y-Pipes Style:Peterbilt 359 - 5 inch OD (outer dimension) Inlet Upgrade the look of yourGrand Rock Peterbilt 359, 377, 378, or 379 Exhaust Y Pipes Grand Rock Peterbilt 359, 377, 378, or 379 Exhaust Y Pipes Replaces Peterbilt Part # 14 13055 Peterbilt Replacement Y Pipe 5 inch diameter ID (inner dimension) Fits Most Peterbilt 377 & 378 Conventional Makes and Models Sold Individually Grand Rock Company is a major manufacturer and warehouse of superior exhaust systems for the aftermarket. Since 1970 Grand Rock has had its sights set on