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Remove the snorkel if you've not done that. It will increase the sound level a bit. Look at the Top Speed test pipes after that. Inexpensive first options. If money isn't an issue Fabspeed is a popular option. Beware the drone of aftermarket mufflers!
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2000 Boxster S
2010 Volvo XC60
2011 GMC Denali HD 6.6L (sold)
2008 Cayenne S (sold)
1989 Targa (sold)
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