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Combined with custom tuning, this simple modification can yield increases of 100 horsepower and 100 ft/lb of torque. Our Titan ProTune comes equipped with 93 Octane as well as 100 Octane maps to help take advantage of the increase in exhaust flow with a simple map switch. As with all exhaust modifications, this is designed for off-road use only or racing use only. Fabspeed O2 Spacer Universal O2 Spacers with real precious metal Catalytic Converters scrub the exhaust and lengthen the distance between the O2 sensor(s) and the exhaust flow to greatly reduce the chance of a check engine light or CEL. The factory ECU compares the readings from a pair of oxygen sensors to measure the effectiveness of the catalysts. When a high-flow cat or catbypass pipe is used the exhaust gases reach the O2 sensor faster and uncleaned, leading to high chances to throw a CEL. Our O2 spacers retract the Primary oxygen sensors from the direct flow of gases, restoring the balance that the ECU requires when using aftermarket catalysts or catbypass pipes. The high quality built in catalysts scrub the exhaust to further reduce the chance of a CEL.