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2-Piece Y pipe for the 4.8L and 6.0L Workhorse Chassis

Part Number: 57-280

Price: $412.80

Made In USA

In Stock, Ready to Ship!

2-Piece 'Y' pipe for the 4.8L and 6.0L Workhorse Chassis. Your original 'Y' pipe is connected at the base by a 'Football Flange'. By keeping these pipes connected at the base the pipes have a tendency to crack just under the flange by the manifold. Our pipes are separated for more flexibility and are doubled in thickness at the manifold area for extra support to help eliminate the cracking issue.

In addition we added heat shields like your originals to reduce the heat penetrating the transmission. Other manufactures that reproduce these pipes do not include the heat shields.

How our pipes work...

Your original 'Y' pipes would be removed. Then just after the connecting flange toward the catalytic converters, the pipes are to be cut. Our new pipes are longer than the originals and fit over your newly cut pipes. Standard pipe clamps are used for connecting the 2 pipes together.


  • Doubled in thickness at manifold area
  • Includes heat shields
  • Separated for more flexibility
  • Made of aluminized steel for longer wear

For gaskets to the manifold order 57-481 and 57-482

OEM/Other Numbers:
  • W0013877
  • W0013802

Estimated Shipping Dimensions: 43" x 15" x 13"

Weight: 20.61 lbs


Mill Supply has been the #1 supplier of step van parts for over 30 years. If you have a Workhorse, Utilimaster, Grumman, Morgan Olson, Supreme, International or other type of walk-in van you have landed on the right page. You will not find a more complete listing of parts for stepvans anywhere! With research and development on-the-go, new products are constantly being added to keep up with the growing industry. You can count on great customer service, fast shipping, and discount prices when you shop with us. It doesn't matter if you use your truck on-the-job, for deliveries, or run a food truck, you can count on Mill Supply to keep your vehicle in top shape. We distrubute parts for Todco, Whiting, Velvac, and Kason. If you have any questions don't hesitate to either contact us via email or give us a call at 800-888-5072 between 8:00 a.m. - 5:00 p.m. E.S.T. and one of our experienced representatives will be happy to help you.



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