Because of the uneven firing order of the cylinders in a V6 like ours, we don't really need crossover pipes. The idea is that there aren't any exhaust pulses arriving into the exhaust at the same time and therefore we don't have a flow obstruction issues. At the same time, crossovers have been shown to increase the efficiency of V6's and make more power..as long as the crossover happens at the correct distance from the headers. Placing it too far or too close is actually detrimental. So you can get away with having a single exhaust, just as long as you have equal length headers.
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