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ya - not sure the catback or axle back gains any HP over stock, so if it's just to improve the sound - axle back will do the trick. I installed a Maganflow axle back. Very happy with it. I did get some drone so I ended up doing a full dynamat type of install in the trunk. Turns out these cars have no sound deadening in the trunk at all and there is a lot of road noise coming up from that area - so that was a huge improvement overall anyway.
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