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A OEM converter should bolt in exactly like the original, an after market may have to be cut and welded in.
Sensor 1 would be before the catalytic converter ( upstream ) Sensor 2 is after the catalytic converter ( downstream )
From what I understand , the oxygen sensor ( s ) upstream of the catalytic converter is used in the control of the air / fuel ratio . The oxygen sensor downstream of the catalytic converter is called a catalyst monitor and monitors the efficiency of the catalytic converter
none as they are pattern copys
The catalytic converter is found in the exhaust system between the engine and the muffler.
There are no differences. High flow catalytic converters are not really high flow; the catalytic converters you have on your vehicle are as high flow as you need them to be. A "high" flow converter will either be of a larger diameter, or the inside is made in such a way that there is less restriction to exhaust flow.
The catalytic converter(s) would be found in the exhaust system between the engine and the muffler.
Direct to fit Catalytic Converters come ready to install with all parts pre-welded. These are better for the DIY professional. Universal converters are cheaper, but require cutting, welding, etc. These installations are best left for the shop professionals.
Crawl under the vehicle and look between the engine and the tail pipe. You will see the catalytic converter.
Pre-catalyst is a catalytic converter that is fitted to Diesel engines to control emissions soon after engine start up when the main catalytic converter is not yet up to operational temperatures. In Europe a pre-catalyst is commonly used where a Diesel Particulate filter is fitted for stage 4 and 5 emissions requirements. The DPF is placed upstream from the main catalyst and in turn prevents the main catalyst heating up quickly enough to control the very initial emissions.
In the exhaust between the engine and the catalytic converter.
Catalytic converters are located in the exhaust system between the engine and the muffler.