Sorry to hear about your Lower Unit Replacement, hopefully your insurance is paying for it? BCB means that on your boat you would actually lose performance out of the Sportmaster because its designed for hulls that run in excess of 85mph, at slower speeds the sportys design has more in the water and slows you down, maybe you can get lucky and find a new used unit on Screamandfly.com for less, if your paying out of pocket….scream and fly is by far the largest High Performance Boating Forum and has a great buy it area…..do not get one of those one off brands, ive heard some horror stories…..Just trying to help Bud, BrannonYour Signature …