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Exhaust systems

When talking about exhausts here, we are speaking about 4-1 or 4-2-1 systems. Four individual exhausts may provide better performance, but at the expense of ground clearance and weight.

A 4-2-1 exhaust (which connects cyl. 1&4 and 2&3 first - this is the only way to do it right!) provides more mid-range and overall power, while a 4-1 exhaust has more peak power, both at the expense of peak power or all-around power, respectively.

Common knowledge seems to have it that the best header length (exhaust valve to collector box) is 70cm (27.5"). The secondary pipe on 4-2-1 systems should be 35cm (13.8").

Questions? Suggestion? Please use the forum!