Pound for pound, nothing creates more horsepower than allowing an engine to breathe easier. You can increase boost, lower Intake Air Temps, but nothing has such a dramatic effect on power gains as raising the Volumetric Efficiency (VE).

Boosting air into an engine is proven to make power, however boost alone is not the only key in making maximum power. Allowing the exhaust to flow as freely as possible is equally as important to the overall equation.

As Forced Intake Air (cfm) increases so must Exhaust Air (cfm) out, otherwise backpressure increases resulting in higher IAT and EGT's.

The fundmental theory behind our exhaust manifolds is simple...

• Match the Existing Head Port Diameters
• Keep Exhaust Flow Paths as Smooth as Possible
• Maximize Thermal Efficiency
• Minimize the Number of Welds

AutoSpeed utilizes CAD software with 3D parametric modeling capability to design the smoothest exhaust paths possible.

These Manifolds are specifically designed for anyone wishing to get the most out of the KO4 Turbos.

We use a simple philosophy...
""Keep the flow diameter constant with little or no reduction in shape, maximize flow and minimize the number of welds"".

• High Quality 304 Grade Stainless Steel
• CNC Machined Flanges from 3/8"" thick Steel
• High Tech Thermal Barrier Coating (Swaintech)

Our exhaust manifolds make lag almost non existent on the K04’s, you will definitely experience instant spoolup and much more breathe up top..

The overall exhaust gas carrying capacity of our tubular design is dramatically increased over the OEM log style manifolds. Each cylinder has its own dedicated conduit where they merge at the collector. This results in much less back pressure.