Just got an Apexi World Sport 2 on. Very quiet after 40mph and during hwy crusing. The only time I notice it's loud is during the initial acceleration. But all I really cared about was it being nice and quiet during crusing speeds. Had a crappy one before that wouldn't even be quiet. It's just the muffler though...you'll need to get custom piping done for a full cat-back.
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