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I am just curious, the OEM cats are usually 600 cells, does that mean 2 cats x 600 cells? or is it 2 cats x 300 cells?
1200 cells seems a lot!
 

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2007 Quattroporte DuoSelect
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Just gutted the secondary useless cats, and Omg what a difference in tone. Just when I thought the sound couldn't get any better. Drove to one of those muffler shops in the hood where I know gutting the cats wouldn't raise any problems. $200 bucks and 2 hrs later I drove off into the California sunset with the biggest smile. They cut along the bend just after the cat, then move the X pipe out the way to allow room for the drilled power cat destroyer. I helped by holding the shop Vac as the guts spewed out to avoid contaminating the air. My set up as follows: gutted secondary cats, Sport X pipe, gutted mufflers. I'll post a Vid as soon as possible.
Did you ever grab a sound clip?
 
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