Ross Sport Service Items are a range of aftermarket products that are of OE quality or better, available for a factor of the cost of the original OEM part.
Details of this specific Ross Sport Service Item: Denso Lambda Front O2 Sensor
OEM Quality part made by Denso, this is not a cheap pattern part.
For Evo Models 5-9, Can also be used on Evo 4 by not connecting the pre-heater wires.
Stock images used. Actual product may vary.