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If your aren't going with headers in the future I would go catback as you will see greater gains with the x pipe. The sound is similar between the two, iv heard the catback has a "smoother" sound but that may just be personal pref. I went with the axelbacks for financial reasons and I plan on doing headers w/ xpipe down the road so anything I didn't gain with the AB's I would pick up with headers.
That said, after seeing those chokepoints, headers just moved up the list..
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