of the suction collector 10 a or intake in the inferior part of the collector 10 c and in the body of the throttle 10 c fig1 shows schematically the position of the resistances 26 in the secondary pipe 23 of air intake close to the exhaust manifold not shown fig1 shows the electric resistances 27 inside the air filter 20 or in the air sending pipe 25 for the body of the throttle 10 c and the secondary pipe 23 and fig1 shows the air warm up inside the air filter 20 or in the air sending pipe 25 for the body of the throttle 10 c the positions of the electric resistances can vary in function of the constructive need of the intake manifold and of the fluid dynamic for new collectors the electric resistances can be considered in the beginning of the project and be positioned strategically inside of the intake manifold itself 10 in the air filter 20 or in air sending pipe 25 for the body of the throttle 10 c in way not to harm the air flow and consequently the performance of the engine for intake manifolds that are in use and with the defined project the best position of the electric resistances is that one inside a secondary pipe 23 this pipe 23 is useful as air intake only when the engine is cold for a better pipe warm up effect 23 this should have a volume the closest as possible of the.