I'll bet I know, sounds like my '03 was. Soft low end and a lot of rattle. The bellcrank setscrew is either loose, or the main adjustment is off allowing a large amount of free play in the mechanism. What is happening is the PV itself is just floating around under pressure of the exhaust pulses. You need to pop the side cover off and adjust out all the free play. Everything else in the PV system is set by mfg tolerances.
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