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EVIL ENERGY is our brand,we're a direct and professional manufaturer in China,one of greatest manufacturer and exporter in Tuning parts include intake system,exhaust system,engine system,cooling system,interior&exterior parts. Accept customized order with minimum quantity. You can try to avoid check valves that are activated by high flow catalytic converters or test tubes. As far as I know ALL O2 sensors are the same thread fits all M18x1.5mm threaded oxygen sensors. Prevent CEL (CHECK ENGINE LIGHT) / MIL (MALFUNCTION INDICATOR LAMP) from illuminating when removing the stock catalytic converter In extreme cases, narrow inlet hole prevents motor failure (high speed driving). Material: Mild Steel Package:2 pieces