Genuine advice from Ian, superb quality and runs a treat with my OS engine
UR352141 - Ultimate Efra 2141 Off Road Super Strong Pipe Set with fast lock manifold
Ultimate Racing introduces the new Super Strong EFRA 2141 exhaust system. This Ultimate EFRA 2141 exhaust system is made of hi-quality aluminum and its a great choice for your 1:8 off road engine, but specially recommended for the M3T Ultimate engine and other OS based engines.
It provides a precise and linear throttle response in the low to mid RPM range with a great top end speed. This pipe set will provide great power to your engine up to the high RPM range optimizing the power curve and fuel efficiency, increasing the runtime almost a minute depending on the track conditions and surface grip.
This exhaust system includes the pipe, the manifold, 3 short springs, 2 medium springs, 1 long spring and 2 manifold gaskets