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2009 boxster would be the dfi engine ? These have different rear silencers to the earlier 3.4 non dfi engined cars as the manifolds are unequal lengths on the left and right hand side of the car on the 2009. The best value for money would be to get a carnewal exhaust , these modify existing stock silencers to give a sporty sound and remove the rear cats to give a little more performance too. Aftermarket systems can be a little boomy at motorway speeds , or there is always the option of the original PSE (porsche sports exhaust) which is switchable.
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