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0L Aluminized 4" Cat Back Single w/ Muffler (421108)
1) delivers much more value than the original
OEM Part Number: 39861
The purpose of the accumulator piston is to dampen the constant oscillation from the LR/CC solenoid and to influence the initial regulation rate of the converter clutch regulator valve
This makes for a much cooler and denser oil
2005-2010 Duramax LLY/LBZ/LMM SoCal Turbo Downpipe (500-1024) 2003 - 2007 Ford Fuel Systems 0L Aluminized 4" Cat BackFits 2004. 5 2010 LLY LBZ LMM applications. 3" diameter 304 stainless steel material for superior thermal qualities. Far superior to 409ss or mild steel. (You wouldn't really use mild steel for a turbo down pipe would you?) Thermal heat wrapped to reduce under hood temperature.