Compared to OS Engines TR01 EFRA2098/TR02 EFRA2165, the power from mid-range has improved. Performance has been improved by applying a special coating to the surface. In addition, the MR04 manifold has improved its power from mid-range by revising the manifold angle of the current product MR02/MR03-WC. With these, there are three types of line-up for 1/8 racing engines that will perform to the max at any track. The exterior of the silencer and manifold has a laser-engraved logo. What's in the box? Tuned silencer TR03 EFRA2196 (72107851) Exhaust manifold MR04 (72107870) (2) Exhaust adapter seal ring (3) Joint spring (2) EX manifold spring