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If anyone comes back across this thread, I ended up going with the Magnaflow 54995. I'm still new to my car, but I didn't notice a hit to power. I also took the advice of my Z mechanic, and T'd off a vacuum hose from the passenger side of the balance bar, just going downward (so it wouldn't be obvious that a vacuum hose was disconnected) to create vacuum leak. His advice is that this would cause it to run lean. I literally did this in a parking lot right outside the inspection place so I wasn't running it long like this. Anyways, with the cats plus the vacuum leak I passed Travis County (Austin, TX) emissions with flying colors. Thanks for the feedback from everyone.
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