Product Details Home > Product > Product Details Products Details MBRP 4″ BLACK SERIES FILTER-BACK EXHAUST SYSTEM|2011-2019 GM 6.6L DURAMAX (ALL CREW & EXT. CABS) Part Number: SKU: S6032BLKBKSJ Categories: 2011-2016 6.6L LML Duramax, 2017-2019 6.6L L5P Duramax, Exhaust Systems Call us now for our best price (574) 349-4354 Product Description Extra Info: MBRP Exhaust BLK Series, Filter Back System. 4in. Filter Back; Single Side; BLK.