EFI Source is one of the fast-growing MegaSquirt resellers! EFI Source is dedicated to supplying the highest quality EFI products to the performance minded automotive community. Our goal is to make programmable EFI systems affordable to everyone without sacrificing quality or functionality. We will constantly be adding new products in order to meet this goal. EFI Source offers select Bowling & Grippo products and also manufactures the GOLD BOX line of professional MS-based controllers.