It's a $10,000 fine to remove your cats. Test pipes are for "offroad" use only. HFCs provide almost the same performance (as noted above 1-3hp less) and then you don't have to worry about issues with cops or the feds.
-mike
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 '14 Touareg TDi | '04 Nissan Armada | '13 Subaru BRZ
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