While D.S.S. sells SuperMOD 5.0 long-blocks with its own mega-ported Power Improved cylinder heads, the company also offers Trick Flow's new, Twisted Wedge 4.6 heads as extra-cost options. We've already done extensive research with these castings, on naturally aspirated ("Natural Progression," Feb. '10, p. 92) and supercharged 4.6-liter ("Light and Lively," Aug. '10, p. 58) engines. What's the bottom line? These heads make killer power either way they're used, and they're perfect for the higher-lift N-52 cams that are part of Nikki's upgrade.