I've heard the exact opposite, to leave the balancer alone. I don't know how the 4.6 is but on my 3.8 you just take the pulley off, and the balancer stays on, you don't have to piggy back anything. It's an ASP pulley.
Theres a few cars out there with the SFI steeda dampers that have had oil pump failures, so I really wouldn't say they are better than piggybacks in terms of reliability. The biggest benifit to those 1 piece SFI dampers is the reduced rotating mass.
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