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Exhaust› Headers, Manifolds and Components
Stainless Works
Stainless Works 2015-18 Hemi Headers 2in Primaries 3in High-Flow Cats
SKU: S00K HM642HDRCAT
Moderate — 2–4 hours
Overview
Each kit includes two exhaust headers, high-flow catalytic converters, oxygen sensor extensions, RTV sealant, and necessary mounting hardware for an estimated one-hour installation.
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Part #: HM642HDRCAT
2015-17 Challenger Headers with 2" primaries, 3" lead pipes with high flow catalytic converters to fit factory connection point or Stainless Works exhausts. Comes Install-Ready with all adapters, necessary clamps, O2 extensions, bolts and RTV silicone.
2015-20 Challenger Headers with 2" primaries, 3" lead pipes with high flow catalytic converters to fit factory connection point or Stainless Works exhausts. Install-Ready with all adapters, clamps, O2 extensions, bolts and RTV silicone.
Vehicle Symptoms
- Engine feels sluggish on acceleration
- Check engine light for catalyst efficiency
- Reduced fuel economy
- Exhaust note too quiet or restricted
- Failed emissions test due to high HC/CO
Diagnostic Codes
- P0420 – Cat Sys Efficiency Below Threshold (B1)
- P0430 – Cat Sys Efficiency Below Threshold (B2)
Relevant Conversations
- P0420 fix on 2015 Dodge Charger 5.7 Hemi
- Stainless Works vs Kooks headers for Challenger
- Symptoms of clogged catalytic converter hemi
- Long tube headers installation difficulty Charger
- Best headers for 2016 Charger SRT
- Catted mid pipe vs off-road headers sound
- Will long tube headers throw check engine light
- How much hp gain from long tube headers on 5.7
- O2 sensor extrensions needed for long tube headers
- Exhaust upgrade for hemi making more power
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Stainless Works |
| Part Number | S00K HM642HDRCAT |
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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