Product Details Home > Product > Product Details Products Details MBRP 4″ BLACK SERIES FILTER-BACK EXHAUST SYSTEM|2017-2021 FORD 6.7L POWERSTROKE (ALL CABS & BEDS) Part Number: SKU: S6289BLKBKSJ Categories: 2017-2020 6.7L Powerstroke, 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; BLK.