Switching from an exhaust manifold to a Performance Exhaust Manifold will decrease the amount of back pressure in the Performance Exhaust System and in turn increase the high-end power of the engine. This is done by using an individual runner (pipe) for each exhaust port that has smoother bends, decreasing airflow resistance.

The runners then merge together at a collector and flow into the turbo. From the turbo the gasses flow into the downpipe and out through the catalytic converter. With an equal length manifold, as each exhaust valve in the head of the engine is opened and exhaust gas is forced out, it passes down one of the manifold runners and through to the turbo, where the exhaust gas velocity in the runner causes a slight vacuum effect in adjoining runner. This has an effect of sucking exhaust gas from the next cylinder releasing exhaust gas which is beneficial for performance.

Stock exhaust manifolds are usually made of cast iron, they can be restrictive and crack under high exhaust gas temperatures. JBS performance manifolds are produced in grade 321 stainless steel and/or high nickel cast iron. These materials have been chosen to protect against the high exhaust gas temperatures created by performance engines. JBS can offer ceramic coatings to reduce the heat radiated in the engine compartment, and to increase the temperature in the runners, which in turn increases the velocity of the exhaust gases.

JBS has produced a new range of tubular manifolds. The new tubular designs concentrate more on collector efficiency and eliminating port sharing.

The manifolds have then been designed and produced directly from the CAD models to ensure best flow capabilities, accuracy and fitment, using laser cut flanges and CNC cut collectors.

All of the JBS tubular design manifolds are produced in-house. The manifolds are built with 321 stainless steel runners and 409 stainless steel flanges, to protect against the higher exhaust gas temperatures.