The FA20 Boxer engine within the Scion FR-S & Subaru BRZ can be said to be the successor to the now famous EJ engine. At Tomei Powered through their extensive testing have already produced a great number of EJ engines and parts and with this new item intend to continue the tradition of quality parts. By using their knowledge and experience of EJ Engines and carrying it over to the FA, they have produced 2 new exhaust manifolds that are truly works of art with exceptional performance characteristics. The manifolds truly outshine the competition especially when used with similar quality Tomei products like the brand new Tomei Expreme Over Pipe and Exhausts. Purchase all your Tomei exhaust components today and discover the night and day performance they can bring you. Because this product replaces/removes an OEM emissions control device we must state that this product is for offroad use only.