Capristo Exhaust 100 Cell Sport Cats BMW 850i G15 1991-1992
Key Features:
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1. Check Engine Light (CEL) Risks & Solutions
Why Does a CEL Appear?
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Removing OEM cats reduces exhaust backpressure, causing rear O2 sensors to detect "insufficient catalyst efficiency."
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This triggers a P0420/P0430 (Catalyst Efficiency Below Threshold) code.
How to Prevent/Fix the CEL:
✅ Option 1: ECU Tuning (Best Solution)
✅ Option 2: O2 Sensor Spacers/Extensions
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Moves the O2 sensor slightly out of the exhaust stream, tricking it into reading "acceptable" emissions levels.
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Works in some cases, but not guaranteed (depends on the car).
✅ Option 3: CEL Defouler Mini-Cats
2. Performance & Sound Impact
3. Installation Notes
4. Legal & Emissions Compliance
🚨 Important:
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Catless setups are illegal for street use in most countries (USA, EU, etc.).
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High-flow cats (200-cell) may still fail strict emissions tests (check local laws).
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CAPRISTO’s system itself is legal, but removing OEM cats makes the vehicle non-compliant.
Fitment Chart:
| Make |
Model |
Style |
Year |
BMW
|
M3
|
G80 |
2021-2024
|
|
BMW |
M4 |
G82 |
2020
|
⚠️ California Proposition 65 Warning:
This product may expose you to chemicals known to the State of California
to cause cancer or reproductive harm.
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