MagnaFlow OEM Grade universal catalytic converter (99556HM) for Chevrolet C2500 + more (1996-2007). It has a 2.5in inlet and outlet. Stainless steel construction with a ceramic substrate for corrosion resistance and long service life. Federal/EPA compliant (not CARB; not legal in CA, CO or NY). Universal design — cutting and welding required to install.
Specifications
| Type | Universal catalytic converter (OEM Grade) |
| Compliance | Federal/EPA compliant (not CARB; not legal in CA, CO or NY) |
| Material | Stainless steel, ceramic substrate |
| Inlet / Outlet | 2.5in / 2.5in |
| Connection | Pipe / weld-on (universal) |
| Quantity | 1 |
| Part Number | 99556HM |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003-2006 | Cadillac | Escalade ESV | Base |
| 2002-2006 | Cadillac | Escalade EXT | Base |
| 1999-2000 | Chevrolet | C2500 | Base |
| 1998 | Chevrolet | C2500 | Cheyenne |
| 1999-2000 | Chevrolet | C2500 | LS |
| 1998 | Chevrolet | C2500 | Silverado |
| 1998 | Chevrolet | C2500 | WT |
| 1999-2000 | Chevrolet | C3500 | Base |
| 1998 | Chevrolet | C3500 | Cheyenne |
| 1999-2000 | Chevrolet | C3500 | LS |
| 1998 | Chevrolet | C3500 | Silverado |
| 1999-2000 | Chevrolet | K2500 | Base |
| 1998 | Chevrolet | K2500 | Cheyenne |
| 1999-2000 | Chevrolet | K2500 | LS |
| 1998 | Chevrolet | K2500 | Silverado |
| 1998 | Chevrolet | K2500 | WT |
| 1999-2000 | Chevrolet | K3500 | Base |
| 1998 | Chevrolet | K3500 | Cheyenne |
| 1999-2000 | Chevrolet | K3500 | LS |
| 1998 | Chevrolet | K3500 | Silverado |
| 2005 | Ford | F-250 Super Duty | Harley-Davidson Edition |
| 2005-2007 | Ford | F-250 Super Duty | King Ranch |
| 2005-2007 | Ford | F-250 Super Duty | Lariat |
| 2005-2007 | Ford | F-250 Super Duty | XL |
| 2005-2007 | Ford | F-250 Super Duty | XLT |
| 2005 | Ford | F-350 Super Duty | Harley-Davidson Edition |
| 2005-2007 | Ford | F-350 Super Duty | King Ranch |
| 2005-2007 | Ford | F-350 Super Duty | Lariat |
| 2005-2007 | Ford | F-350 Super Duty | XL |
| 2005-2007 | Ford | F-350 Super Duty | XLT |
| 1998-2000 | GMC | C2500 | Sierra SL |
| 1998-2000 | GMC | C2500 | Sierra SLE |
| 1998-2000 | GMC | C2500 | Sierra SLT |
| 1996-2000 | GMC | C3500 | Sierra SL |
| 1996-2000 | GMC | C3500 | Sierra SLE |
| 1996-2000 | GMC | C3500 | Sierra SLT |
| 1998-2000 | GMC | K2500 | Sierra SL |
| 1998-2000 | GMC | K2500 | Sierra SLE |
| 1998-2000 | GMC | K2500 | Sierra SLT |
| 1996-2000 | GMC | K3500 | Sierra SL |
| 1996-2000 | GMC | K3500 | Sierra SLE |
| 1996-2000 | GMC | K3500 | Sierra SLT |
| 2006 | GMC | Yukon | SL |
| 2000-2006 | GMC | Yukon | SLE |
| 2000-2005 | GMC | Yukon | SLT |
| 2005-2006 | GMC | Yukon XL 1500 | Denali |
| 2004 | Jeep | Wrangler | Rubicon |
| 2004 | Jeep | Wrangler | Sahara |
| 2004 | Jeep | Wrangler | SE |
| 2004 | Jeep | Wrangler | Sport |
| 2004 | Jeep | Wrangler | Unlimited |
| 2004 | Jeep | Wrangler | X |
| 1996 | Pontiac | Bonneville | SE |
| 1996 | Pontiac | Bonneville | SSE |
| 1996 | Pontiac | Bonneville | SSEi |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
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