The number I have heard is about 210+ stock from the factory. A good cleanup job will get them to about 230 or so. I paid around $500 to get my 16's fully prepped. Flow numbers were 232 CFM at 0.500 inches of lift. I didn't ask to have anything special done just prepped to put on my car. The gentleman who performed the work said that he was mainly trying to get the flow back to as designed versus what comes out of casting.