89muscle

i like my unequal bbk's, considering they dont add much horsepower but. hey go with what ya like ya know?

makarovboy

This is the theory. Equal length tubes are designed so that the exhaust pulse from one cylinder enters and exits the collector before the next cylinders exhaust pulse reaches the collector. On unequal length tubes, they tend to overlap in the collector, causing more back pressure, i.e., less power.