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It's common knowledge that one of the most cost effective methods of improving a car's performance is to install a set of free-flowing, full length exhaust headers.

Headers not only increase horsepower, but improve throttle response and fuel efficiency.

Once proper diameter tubes are selected, primary tube length, measured from the flange to the collector, is another important consideration.

An engine with larger tube headers may actually make more peak horsepower on a dyno, but at the sacrifice of low- and mid-range power, a loss particularly noticeable on a circle track car exiting a corner, or on a drag car at launch and after gear shifts.

The type of car/chassis, engine type/displacement, cylinder head/valve sizing and operating RPM range must all be taken into consideration before investigating the primary tube and collector dimensions of available headers.