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Brommers
mcmyk
There are various ways to ensure a good finish on both the A&B surface, internal and external formers is one but you can also achieve a pretty good finish by putting the part on a single sided tool and vacuum bagging it
I have an SBD crabon airbox on my jenveys and the inside surface isn't as good as the outside by any means, i don't think surface finish on the inside of the airbox is really that important as it's going through a set of trumpets anyway normally