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think the two-stage intake manifold runners have a lot to do with that.
what do these things actually do?

Two intake runners per cylinder, one long, one short. At low rpm the long intake runners are open, enhancing torque. At higher rpm (I wanna say around 3000 rpm but could be wrong) the short runners take over for enhanced breathing/horsepower. Bottom line is it gives a flatter torque/hp curve. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Steve Carlson - 95 Trooper LS expo rig
Serenity now!