If you want real data in choosing your /6 upgrades I plotted the data from this article:
Slant Sickness! How To Add 77 HP To Your Mopar Slant Six! - Hot Rod Network
It seems to me the Dutra Duals are cools looking but for the bang for the $600 buck is not there for me in the typical cruising RPM but letting it breath has a HUGE benefit.
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