4'' CAT Race Exhaust Pipe for 2015.5-2016 Duramax 6.6L 2500 3500 LML EC-CC/SB-Dually w/oem 3-Bolt Flange No reviews yet8 sold Ningbo Haishu pino Metal products Co.,LtdCustom manufacturer2 yrsCN Previous slideNext slide Previous slideNext slideKey attributes Industry-specific attributes Car...