GM & Workhorse Stepvan Exhaust Systems

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  Aluminized Muffler

  SKU: 57-425

  Aluminized muffler, (2) 2-1/2" inlet, (1) 3" outlet, '96-On GM/Workhorse

  $211.90

   
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  Hanger for Double Pipe

  SKU: 57-455

  Hanger for Double Pipe - 1996 - On GM / Workhorse including the W42 RV chassis.

  $74.07

   
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  Aluminized Tail Pipe

  SKU: 57-234

  Aluminized tail pipe, 3" dia. Formed in two pieces for shipping purposes. 1991-on

  $115.95$104.36

  Clearance Sale
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  Y-Pipe for the 350 engine from 1979-95 GM and Workhorse Chassis

  SKU: 57-238

  Y-Pipe, .made with 409 stainless steel

  $310.80

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

  SKU: 57-280

  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 ... more

  $698.36

   
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  Insulator Hanger

  SKU: 57-433

  Rubber insulator hanger for exhaust

  $13.95

   
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  Exhaust Manifold Kit, 6.0L - Left Side

  SKU: 57-380

  Left Exhaust Manifold Kit - 6.0 Liter Engines. Includes 3 studs, 3 nuts and a gasket - Drivers Side

  $209.95

   
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  Aluminized Muffler

  SKU: 57-220

  Muffler with 3" fittings. Fits 87-on Chev P-30 with 350 c.i. engine

  $87.95

   
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  Exhaust Pipe Gasket - Right Side

  SKU: 57-482

  Right Exhaust Gasket. Fits on the right side of our 57-280 Y pipe and fits our pipe 57-9163

  $16.00

   
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  Aluminized Extension

  SKU: 57-213

  Pipe Extension, 3" dia. x 55" long. Fits 87-on Chev P-30 with 350 c.i. engine

  $59.80

   
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  Exhaust Manifold Gasket - Left Side

  SKU: 57-481

  Left Exhaust Gasket. Fits on left side of our Y pipe 57-280. Also fits our 57-9162 left side exhaust pipe.

  $11.50

   
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  Right Exhaust Manifold Kit

  SKU: 57-363

  Right Exhaust Manifold kit that fits Chevrolet 8 cylinder, 350 CID '87-ON, includes: 3 studs, 3 nuts, 3 springs. Come with Preheat Sh... more

  $105.92

   
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  Left Exhaust Manifold Kit

  SKU: 57-385

  Left Exhaust Manifold kit that fits Chevrolet 8 cylinder, 350 c.i. engine, 1996-on. Order gasket set 57-390 separately.

  $273.96

   
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  Exhaust Manifold Kit 6.0L - Right Side

  SKU: 57-381

  Right Exhaust Manifold Kit - 6.0 Liter Engines. Includes 3 studs, 3 nuts and a gasket - Passenger Side

  $201.78

   
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  Aluminized Extension Pipe

  SKU: 57-211

  Aluminized extension pipe, 14ga, 2-1/2 dia. x 59-3/4", '76-87 for 178" WB, cut for shorter wheelbase.

  $56.50

   
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  3" Muffler/Exhaust Pipe Clamp

  SKU: 57-300

  3" muffler/exhaust pipe clamp. Guillotine (single saddle) style.

  $4.42

   
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  Football Shaped Flange Gasket

  SKU: 57-315

  Football shaped flange gasket, fits 4.3L, 4.8L, 5.7L and 6.0L

  $31.11

   
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  Universal Pipe Hanger

  SKU: 57-437

  Universal pipe hanger. Heat this 1/2" dia. x 11" rod and bend it around pipes or mufflers and weld it on. or use two, one welded to t... more

  $7.20

   
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  Y-Pipe

  SKU: 57-240

  Y-pipe for 6.5L diesel

  $439.08$408.34

  Clearance 7 available.
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  Aluminized Muffler

  SKU: 57-222

  Muffler, fits 76-81 Chev P-30 with 350 c.i. engine

  $88.95

   

Mill Supply's GM/Workhorse exhaust system line covers a vast amount of applications and it keeps on growing. We stock parts that fit from 1976 chassis' to today's most current chassis'. We also carry parts for the 1982-1994 6.2L diesel chassis as well as the 1995-present 6.5 liter diesel chassis. We make it a priority to be able to have the parts you need no matter how old or new your stepvan may be.

Our newest addition to our GM/Workhorse line is a two piece Y pipe. It fits the 4.8L and 6.0L Workhorse gasoline chassis'. Our staff designed this new Y pipe to eliminate the "football flange" design which is known for causing cracking by the manifold. The cracks by the manifold are a result of the flange design which does not enable the pipes to flex.