Patent ID: 7934375

Claim:
A balance pipe assembly for a vehicle exhaust system comprising at least a pair of exhaust pipes or pipe shaped portions, a further pipe or pipe shaped portion extending between the exhaust pipes or pipe shaped portions so as to act as a balance pipe, at least one of the exhaust pipes or pipe shaped portions comprising means adapted to reduce the pressure of exhaust gasses passing there through at a position downstream of the balance pipe or pipe shaped portion, and a pipe or pipe shaped portion that is adapted to promote the swirling of exhaust gases passing there through, wherein each of the exhaust pipes or pipe shaped portions comprises a portion that is adapted to promote the swirling of exhaust gases passing there through, wherein the pipe or pipe shaped portion that is adapted to promote swirling of exhaust gas passing there through is located at a position downstream of the venture, wherein the or each pipe or pipe shaped portion that is adapted to promote swirling commences at or near the venturi and progressively opens up in a downstream direction until the pipe or pipe shaped portion once again has substantially the same diameter downstream of the venturi as it did upstream of it, and wherein the or each portion that is adapted to promote the swirling of exhaust gas passing there through comprises a swirled groove formed into the wall thereof.