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GM & Workhorse Stepvan Exhaust Systems

Showing 1-20 of 56

  • Part Number: 57-425

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

  • Part Number: 57-290

    OE Style catalytic converter assembly

  • Part Number: 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

  • Part Number: 57-234

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

  • Part Number: 57-218

    Replacement Catalytic Converter for gas engines. This is a new converter, not rebuilt, and has 3" pipe connections for the inlet and ... more

  • Part Number: 57-215

    Catalytic Converter used for single or dual exhaust for 87 and newer Chev P-30 with 350 c.i. engine under 9500 lbs. GVRW. W... more

  • Part Number: 57-455

    Hanger for Double Pipe - 1996 - On GM / Workhorse

  • Part Number: 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

  • Part Number: 57-205

    Replacement 'Y' pipe for 4.3L and 5.7L GM/Workhorse chassis, 1996-on. Pipes are held together with 'football flange' as original.

  • Part Number: 57-220

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

  • Part Number: 57-433

    Rubber insulator hanger for exhaust

  • Part Number: 57-379

    Right exhaust manifold kit 4.8L gasoline engines

  • Part Number: 57-240

    Y-pipe for 6.5L diesel

  • Part Number: 57-213

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

  • Part Number: 57-381

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

  • Part Number: 57-211

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

  • Part Number: 57-238

    Y-Pipe, .made with 409 stainless steel

  • Part Number: 57-482

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

  • Part Number: 57-315

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

  • Part Number: 57-385

    Left Exhaust Manifold kit that fits Chevrolet 8 cylinder, 350 c.i. engine, 1996-on. Includes fitting for EGRV recirculating pipe (rec... more


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.



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