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What do you mean it might not be worth it for a 2.7? Are looking for an aggressive sound or performance? There is minimal performance from an exhaust upgrade only. If it is sound, then you want a top name brand system as many of the cheaper versions will have you ending up with a drone sound that will drive you crazy in the 2500 to 3000 rpm range (final drive rpm range) but sound great in the higher revs for a short period of time. If you use your car for any longer drives, the drone will have you wishing for the stock exhaust.
I ran a Borla system with catless headers on my Boxster S and had to take it off. Went back to stock and am much happier.
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