What drawback of collector-type exhaust systems is more than offset when used on turbocharged engines?

The drawback of collector-type exhaust systems that is particularly notable is the loss of horsepower due to exhaust system back pressure. In a traditional exhaust setup, back pressure can lead to reduced engine performance; this is because the engine has to work harder to expel exhaust gases. However, in turbocharged engines, this situation is somewhat mitigated.

Turbochargers utilize exhaust gases to spin a turbine, which compresses intake air, thereby increasing engine power output. In this context, some degree of back pressure can actually enhance the turbocharger's efficiency and performance by ensuring that there is enough exhaust flow to keep the turbine spinning optimally. Therefore, while collector-type systems might typically cause a loss of horsepower due to increased back pressure, in turbocharged applications, this trade-off can contribute positively to the overall effectiveness of the engine by maintaining or increasing power levels.

This understanding helps highlight why the use of collector-type exhaust systems may not be as detrimental in turbocharged engines as it would be in naturally aspirated engines, where maximizing power output is critical and any increased back pressure is typically undesirable.