An exhaust system has one or more exhaust tubes having a first diameter, interfaced to an exhaust manifold at one end and open at an opposite end for exhaust gas to escape, and a tubular extension of a second diameter, larger than the first diameter, joined to the open end of individual ones of the exhaust tubes, the extension cut at an angle with vertical and joined to the exhaust tube in a manner that exhaust gas expanding at the open end is free to expand upward, but expanding downward strikes the tubular extension, creating a downward force on the exhaust system.