42 mm to 63,5 mm exhaust connection adapter — TA Technix

The small hardware you need to finish an exhaust system: flanges, sleeves, spare parts, and especially lambda sensor adapters.

When a catalytic converter is removed, the downstream sensor no longer detects what it expects and the engine warning light comes on. An adapter positions the sensor in a bypass, away from the flow: the fault often disappears without modifying the electronics. It treats the symptom, not the mapping - and it does not make the car road legal.