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      11-15-2017, 12:59 AM   #2
InspireSiR
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Drives: 2013 BMW M3 E92
Join Date: Oct 2005
Location: Los Angeles, CA

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I have Challenge Street which keeps primary cats but removes secondary cats. I then had resonators removed by a muffler shop. So it is essentially a stainless steel mandrel bent system from the cat back. Drone will depend on which mufflers you go with. No rasp since you're keeping the primary cats. Hope that answers your questions.
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