Patent ID: 7950228

Claim:
A turbo charge system of an engine, comprising: a pair of exhaust manifolds respectively mounted to cylinder heads at both sides of the engine; a pair of turbo chargers respectively connected to the pair of exhaust manifolds and increasing intake air amount by using energy of exhaust gas; and a crossover pipe connecting the pair of exhaust manifolds with each other; wherein the crossover pipe is mounted in each cylinder head; wherein the crossover pipe is formed as a double pipe structure comprising an inner pipe and an outer pipe; wherein both ends of the inner pipe are fixed by expansion rings that are formed between the inner pipe and the outer pipe wherein a first end of the expansion ring is positioned at a distal end of an interior surface of the outer pipe and a second end of the expansion ring contacts at least an internal portion of the outer surface of the inner pipe; and wherein a distal end of the outer pipe is integrally formed with a gasket protruding toward the expansion ring and contacts the first end of the expansion.