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Here are some options:
1. MPPSK - M Performance Power and Sound Kit - Cat back exhaust with valves (quiet in comfort/eco and loud in sport/sport plus) and a mild engine tune similar to MHD/BM3 Stage 1 flash. This is expensive but does not void warranty. (about $3,000)
2. AWE or Dinan Midpipe and a Stage 1 tune with MHD or BM3. This will give you some more sound and still utilize the factory exhaust flap with the stock muffler. You can also get a dual resonator delete which does the same thing as the Dinan/AWE Midpipe and might be cheaper. (about $600-$700 for the midpipe and $500 for the tune; cost of dual resonator delete varies by exhaust shop)
3. Catback Exhaust and Stage 1 Tune. This is if you want more noise than option two. Some catback exhausts utilize the factory valve (AFE) and some do not (Dinan/AWE). If the valve is something you want to keep, I would make sure you pick the right catback or just stick with option 2. ($2000 for the catback, $500 for the tune)
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