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By certification 
EXHAUST GAS RECIRCULATION COOLER （EGR cooler）- square style
The square style uses more of a "radiator" style of channels and fins. It’s for 2005 model or newer.
The principle of EGR is that a controllable proportion of the exhaust gas is recirculated back into the engine. Its purpose is to cool down the exhaust gas before they are returned into the engine to reduce NOx values further more.
World class manufacturing and testing equipment, such as vacuum brazing furnace, advanced assemble machines, air-and-water leaking test machines, computer-controlled simulation test machines, helps us manufacture premium quality EGR coolers with clean and nice appearance.
Every part is pressure tested and final fitment checked. All units are 100% traceable, making employees that worked in that specific part accountable.
FAQ
Q1: What’s your main product ?
A: Catalyst, Catalytic Converter, DOC, DPF, SCR, Exhaust manifold, EGR cooler and muffler.
Q2: Is it all right to make customer's own brand name?
A: Yes.
http://www.exhaustcats.com/
