A few years ago I had a non X system with ultraflos sounded good but at full throttle it was super loud.I installed a X crossover it had a slightly louder idle,quieter at cruise and much quieter but still noticeable full throttle.It picked up almost a tenth at the track with an X.I currently have a three inch X crossover on it now Zero ground clearance issues.Properly installed they tuck up nice and high.
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