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Magnaflow 99556HM

OBD-II Universal Catalytic Converter 477 C.I.D./7.8L 7000 lbs. Limit

Magnaflow 99556HM

642-99556HM

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Magnaflow 99556HM OBD-II Universal Catalytic Converter 477 C.I.D./7.8L 7000 lbs. Limit $155.74
OBD-II Universal Catalytic Converter
  • 477 C.I.D./7.8L 7000 lbs. Limit
  • Federal Emissions
  • Body Shape: Oval Center/Center
  • Inlet: 2.5"
  • Outlet: 2.5"
  • Body Length: 12"
  • Width: 7"
  • Overall Length: 16"

  • Specifications:

    Inlet Size (in.)
    2.5
    Outlet Size (in.)
    2.5
    Material
    Stainless Steel
    Overall Length (in.)
    OEM
    Emission
    Non-California (49-State)
    Converter Body Size
    OEM
    Core Substrate Material
    OEM
    California Air Board Approved
    No
    Universal Or Specific Fit
    Universal
    Catalytic Converter Format
    Pre-Catalytic Converter and Main Catalytic Converter
    Oxygen Sensor Location
    N/A
    CAT Converter Air Tube Adapter
    Not Air Tube Kit Adaptable
    Recommended Use
    Converter
    Body Size
    OEM
    Substrate Material
    OEM
    Manufacturer's Part Number:
    99556HM

    Magnaflow OBD-II Universal-Fit Federal Emissions Catalytic Converters are designed for engines built in 1996 or after. Each converter has a ribbed stainless steel body that minimizes expansion and distortion when the converter heats up. The ribs form a channel that protects the cushioning mat from direct exposure to exhaust gas and they hold the ceramic catalyst in proper alignment. An aluminized or stainless OE-style ribbed heat shield creates a rigid wall of protection against heat and adds to the structural stability of the converter. Magnaflow converters have a 1/2" lap-joint where the necks meet the body. The neck does not extend into the converter body where it could hamper exhaust flow. This is the strongest and smoothest flowing inlet/outlet joint of any manufacturer. A monolithic honeycomb catalyst is utilized. The ceramic is designed for maximum flow and surface area. The coating method is strictly controlled to maintain exact specifications. .

    Selecting the Proper OBD-II Universal-Fit Catalytic Converter
    Determine engine size and vehicle weight first. Converters are listed according to legal engine size and vehicle weight. Determine the type of converter being replaced. PRE OBD-II converters are for vehicles built before 1996. If the vehicle was built in 1996 or after, an OBD-II converter must be used. If engine has been changed and is not the same model year as the chassis, proceed as follows:

  • If the engine is older than the chassis, select the converter according to the chassis model year.
  • If the engine is newer than the chassis, select the converter according to the engine requirement.

    Check whether the vehicle is Federal or California Emissions. Required by the EPA, this information is on the vehicle emission control information label (example shown below) located in the engine compartment in a visible position on the hood underside, shock tower, radiator support, fan shroud, or firewall.

    Note: Federal emissions 49-state catalytic converters are not legal for sale, installation, or use on licensed vehicles in the state of California.

  • Does Magnaflow 99556HM fit your vehicle?

    Narrow Results

    1998-1999 GMC K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET C2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: CHEYENNE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998-1999 GMC K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1999-2000 CHEVROLET K3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET K3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996-2000 GMC K3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996-2000 GMC C3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SL
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET K3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: CHEYENNE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998-2000 GMC C2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SL
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2005-2006 GMC YUKON XL 1500

    • Fitment_Note: Cutting And Welding Required During Installation
    • EngineType: ALL
    • SubModel: DENALI

    2000 GMC K2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2004-2006 CADILLAC ESCALADE ESV

    • CC: 5967
    • Fitment_Note: Cutting And Welding Required During Installation
    • Liter: 6.0
    • SubModel: BASE
    • CUI: 364
    • EngineType: V8 ( 6.0 L / 364 )

    1999-2000 CHEVROLET K3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: LS
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996-2000 GMC K3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2000-2006 GMC YUKON

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 4.8
    • SubModel: SLE
    • CUI: 294
    • EngineType: V8 ( 4.8 L / 294 )

    1996 PONTIAC BONNEVILLE

    • CC: 3800
    • Fitment_Note: Cutting And Welding Required During Installation
    • Liter: 3.8
    • Aspiration: N
    • SubModel: SE
    • Engine Vin: K
    • CUI: 231
    • EngineType: V6 ( 3.8 L / 231 )

    1996-2000 GMC C3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2004 JEEP WRANGLER (TJ)

    • Liter: 4.0
    • SubModel: RUBICON
    • CUI: 242
    • EngineType: L6 ( 4.0 L / 242 )

    2004 JEEP WRANGLER (LJ)

    • EngineType: ALL
    • SubModel: ALL

    1998 CHEVROLET K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET C3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996 PONTIAC BONNEVILLE

    • Fitment_Note: Cutting And Welding Required During Installation
    • EngineType: ALL
    • SubModel: SSEI

    1999-2000 CHEVROLET K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998-1999 GMC K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SL
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2004 JEEP WRANGLER (TJ)

    • EngineType: ALL
    • SubModel: SAHARA

    1998 CHEVROLET C2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: WT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1999 CHEVROLET C2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET C2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2000 CHEVROLET C2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: LS
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2006 GMC YUKON

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 4.8
    • SubModel: SL
    • CUI: 294
    • EngineType: V8 ( 4.8 L / 294 )

    2004 JEEP WRANGLER (TJ)

    • EngineType: ALL
    • SubModel: SPORT

    1998-2000 GMC C2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996-2000 GMC K3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SL
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2000-2005 GMC YUKON

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 4.8
    • SubModel: SLT
    • CUI: 294
    • EngineType: V8 ( 4.8 L / 294 )

    1999-2000 CHEVROLET C3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET C3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: CHEYENNE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996 PONTIAC BONNEVILLE

    • CC: 3800
    • Fitment_Note: Cutting And Welding Required During Installation
    • Liter: 3.8
    • Aspiration: N
    • SubModel: SSE
    • Engine Vin: K
    • CUI: 231
    • EngineType: V6 ( 3.8 L / 231 )

    1999-2000 CHEVROLET C3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: LS
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996-2000 GMC C3500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1999 CHEVROLET C2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: LS
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1996 PONTIAC BONNEVILLE

    • CC: 3800
    • Fitment_Note: Cutting And Welding Required During Installation
    • Liter: 3.8
    • Aspiration: S
    • SubModel: SE
    • CUI: 231
    • EngineType: V6 ( 3.8 L / 231 )

    2000 CHEVROLET C2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2000 GMC K2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: WT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998-2000 GMC C2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1998 CHEVROLET K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: CHEYENNE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2004-2006 CADILLAC ESCALADE EXT

    • CC: 5967
    • Fitment_Note: Cutting And Welding Required During Installation
    • Liter: 6.0
    • SubModel: BASE
    • CUI: 364
    • EngineType: V8 ( 6.0 L / 364 )

    2004 JEEP WRANGLER (TJ)

    • Liter: 4.0
    • SubModel: X
    • CUI: 242
    • EngineType: L6 ( 4.0 L / 242 )

    2000 GMC K2500 PICKUP

    • Fitment_Note: Up To 15000 Gross Vehicle Weight~Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: SIERRA SL
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1999-2000 CHEVROLET K2500 PICKUP

    • Fitment_Note: Universal Federal [Exc. CA]~[Available While Supplies Last]~Cutting And Welding Required During Installation
    • Liter: 7.4
    • SubModel: LS
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2004 JEEP WRANGLER (TJ)

    • CC: 2429
    • Liter: 2.4
    • SubModel: SE
    • CUI: 148
    • EngineType: L4 ( 2.4 L / 148 )

    1996 PONTIAC BONNEVILLE

    • CC: 3800
    • Fitment_Note: Cutting And Welding Required During Installation
    • Liter: 3.8
    • Aspiration: S
    • SubModel: SSE
    • CUI: 231
    • EngineType: V6 ( 3.8 L / 231 )
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