They also have headers at KGTrimning, as well as triple DCOE manifolds (and the carbs too). Another intriguing item to be found in their catalog is a 92mm B30 headgasket - to allow the use of a set-and-a-half of B21 pistons for a big bore B30 - B33 if you will. I know from experience that the extra 3mm makes a real difference on a B20, I would imagine it would have a similar effect on a B30. More low end power immediately, more high end power if accompanied with breathing improvements (IHE). They also sell several flavors of modified B30 heads.