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The single-most important performance improvement featured in this engine is the custom tube-style headers and non-wastegated Garrett turbochargers. The headers were built of heavy-wall, drawn-over-mandrel (DOM), 1.625-inch o.d. 1.45-inch i.d tubing. The four tubes were routed into a simple, four-tube collector, which mounts the turbocharger. The turbochargers were custom-engineered by BD Diesel Performance's John Todd. These turbos were designed to operate at high efficiency with an output of 30 psi boost at maximum engine speed. That boost falls to 22 psi at the shift recovery rpm.
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