Also available: UHO 4.500" Core (85200) | Fabricator 6-Pack (650200)
EPA-COMPLIANT CORE-ONLY FLOW FOR CUSTOM EXHAUST BUILDS — G-SPORT GEN2 ADVANCED HO CORE
The G-Sport Gen2 Advanced HO Catalytic Converter Core (50200) is the core-only version of the Gen2 HO converter: a bare 4.000" OD x 4.000" long substrate canister ready for full custom integration. Rated up to 500hp per core (per exhaust bank), it lets fabricators build the converter into the system exactly where and how the routing demands.
This is the catalytic core only — transition cones are sold separately. The matching cones for a 4.000" OD body are the 2.500" Transition Cone (94025) and 3.000" Transition Cone (94030), or you can fabricate your own transitions.
The GEN2 Advanced series pairs GESi's proven S-Wound metallic substrate in a 400 CPSI cell count with their latest proprietary precious-metal coating, developed for the advanced OBD monitoring strategies on 2017 and newer vehicles — the combination that prevents catalyst-related check engine lights on late-model platforms. Gen2 is also fully compatible with earlier model years, making it the safe choice when in doubt.
FEATURES
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Core-only format for full custom exhaust integration — weld directly into your system
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400 CPSI S-Wound metallic substrate — thinner cell walls than ceramic mean more open flow area per cell
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Proprietary GEN2 precious-metal wash coat engineered for 2017 and newer emissions monitoring
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Nickel-lined, furnace-brazed substrate locked to its stainless mantle — will not telescope or fail under boost
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300 Series stainless steel construction; withstands exhaust temperature spikes up to 1,600°F
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EPA compliant — third-party lab tested (not CARB certified; not for use on emissions-controlled vehicles in California)
SPECIFICATIONS
- Sold As: Catalytic core only (transition cones sold separately)
- Body Diameter: 4.000" OD
- Overall Length: 4.000" (±0.125")
- Cell Count: 400 CPSI
- HP Rating: up to 500hp per core (per exhaust bank)
- Substrate: S-Wound metallic, furnace-brazed
- Material: 300 Series stainless steel
- EPA Compliant: Yes (not CARB certified)
- Weight: 2.66 lbs
- Connection: Welding Required
PERFORMANCE
In instrumented dyno testing with pressure probes upstream and downstream of the substrate, a properly sized G-Sport high-flow catalytic converter produced horsepower and torque curves identical to a straight pipe, with no measurable pressure drop across the core. Emissions reduction runs up to 99% for carbon monoxide, 98% for nitrogen oxides, and 95% for hydrocarbons.
APPLICATIONS & FITMENT
Choose the Gen2 HO core for custom builds up to 500hp per exhaust bank. Building past 500hp? The Gen2 core line steps up with body size: UHO 4.500" (85200, 850hp), UHO+ 5.000" (85500, 1,000hp), and UHOX 6.000" (85600, 1,200hp). Prefer a weld-ready converter with cones already installed? See the Gen2 HO 2.500" (50225) and Gen2 HO 3.000" (50230) assemblies. For 2016 and older vehicles, the Gen1 HO Core (50002) offers the same construction with a higher-flow 300 CPSI substrate.
For the full selection guide, see Understanding the G-Sport Catalytic Converter Lineup and our G-Sport FAQ.
INSTALLATION NOTES
This core welds into your system via transition cones (94025 or 94030 for this body size) or custom-fabricated transitions. For best catalyst light-off and CEL prevention, install it as close to the OEM converter location as practical — on custom systems, within 8"–24" of the turbo outlet or header collector. In dual-bank systems, run the same core model on both banks; mixing generations or sizes between banks can cause uneven backpressure and inconsistent O2 readings. Full best practices, common mistakes, and a pre-flight checklist are in our G-Sport Installation Guidelines.
Not sure which generation or output tier your build needs? Email us at support@aceraceparts.com with your platform, power goal, and tubing size and we will point you to the right part.
