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Not to pee in anyones cheerios but fast intention cats are 300 cell CANAMEX Thunderbolt cats commonly found on ebay for $50/per. I took down the part # when I had the F/I parts in my hand.
They are used in some of the highest hp M3 dyno charts available (including my car). I don't see the downside to them over catless at the moment. I was happy enough with their performance that I now use them in our STi/EVO builds.
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