1Decat Performance Mid Pipe replaces both the primary and secondary catalytic converters to create a free flowing exhaust. Direct mid pipe replacement fit for 125 250 390 RC390 2017+ . 2With the added an advantage of keeping your rear shock cooler, ensuring longer life and reduced damage. Compatible with the OEM silencer/muffler and others that fit the original catalytic converter. 3Made of 304 stainless steel with a thickness of 1mm/0.04in, glossy, heat and high temperature resistant, which has long durability. 4Reduces heat and increase air flow, performance Decat pipe weighs 770g/1.7lbs, original primary and secondary weigh 4.01kg, saving 3.24kg/ 7.1lbs weight in the catalytic section. Gain anywhere from 5 to 6HP, get the sound and performance by adding this midpipe. 5No modifications required. (Re-mapping, Power commander). Lambda sensor (O2 sensor) is located on the original front pipe which is retained and used with this upgrade.