Barr Marine's Crusader style high profile exhaust riser mounting package. Crusader High Profile Exhaust Riser Mounting Package | Barr Marine CR-20-29015P Crusader style high profile exhaust riser mounting package. Used for mounting CR-20-29015 exhaust high-profile riser on Crusader Marine GM V8 small block (305-350 CID) and big block engines (454 & 502 CID) Includes mounting gasket, bolts, studs, lock washers, nuts, drain plugs, and pipe plugs