!cat-back will drop 60-75lbs normally.
i would go with the !cat and a normal cat back. it is less likely to attract attention from the po-po i fhe sees a muffler or at least tips sticking out the back than nothing.
the cat itself is also the big restriction in the exhaust stream. ditching that will easily add twice as much power as jsut dropping the cat back, especially after you get teh computer tuned for !cat.
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