987 S Aftermarket Exhausts

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Can anyone help. Ive took the plunge on a new Boxster (ariving April). I place a couple of grand deposit to secure last June, and took a test drive December, of which i thought, nice car, ill have to up the volume a bit though. Then sitting down for the option chew, realised there was no Porsche sports system. Now i am half regreting the purchase as, nice as the standard car sounded, for the odd sunny sunday blast, i wanted an exhaust note a bit fruitier. Can anyone recomend a rude system, that will not offend the dealer to much regarding warrantee.