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A HFC isnt going to reduce performance too much and a test pipe shouldn't hurt mpg or reliability but definitely get an over-pipe with it, you'll see far bigger gains. it up to what you want and how strict the laws are where you are. i ran catless for years in my s2k in canada and no-one cared but i cant say the same for south florida. IMHO get a Catted pipe will help to quiet an exhaust a little bit. maybe reduce drone as well
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