The IAME biconic spring is specially designed to connect the exhaust manifold and the relaxing pot on the motorizations X30 and KA100. Its "biconic" shape (wider at the ends only at the ends) is not aesthetic: it allows a uniform distribution of the voltage and a better absorption of the high frequency vibrations specific to the 2-time competition engines.

Made in high carbon steel, this spring retains its elastic properties even when subjected to the extreme temperatures of the exhaust outlet.