I have - and recommend - the Walker DynoMax Super Turbo cat-back system. Available in 2 1'4" (stock) and 2 1/2" pipes. Nice quality.
Just above stock sound at idle, nice rumble at WOT but never obnoxious or annoying at cruising speeds or around town at lower RPM's. Just enough sound so you know it's a performance car without attracting cops or setting off alarms when you drive by (and giving you a headache on a trip).
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