They use a totally different process then the casting sand method Edelbrock use. It is actually a better method, of making the intakes, makes for better runners then the Edelbrocks they are ripping off.. But they are having issues else were in the process that makes them substandard. The material composition seems to be the same. When grounded out and checked for consistancy. But they are not an intake to be used right out of the box In my opinion. they need to be ground/ported and polished to work.