“OP” stands for the OT propeller. The company is now widening its range of exhaust In-Line kits that are known for their extraordinary performance and the very convenient price. In-Line OP kits are a milestone for 1:8 off-road  and on-road fans alike. Let us introduce you the newcomer: thanks to its special chrome-plated coating, it looks very appealing and facilitates the exhaust gas dynamics. It has Efra “2053” homologation and is available in three different configurations: an on-road and rally games kit with conical collector for transverse engine and two off-road kits with a long and a short collector, the long collector for low rpm and the short one to perform a very high number of rotations.