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I bought a set of Ztherapy SU's back in 2002. They have performed fine and tune well on a decent motor. Idle is good.
That being said I would recomment Rhys or Joe Curto. Rhys especially is active on the forums and very helpful. If I had it to do over again I would use Rhys.
Ztherapy weren't very great from a customer service standpoint but that may have changed since then. But at the time they weren't too focused on Volvo SU's, got the feeling they did them simply because they were equipped to work on them.
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