There is an additional HP or 3 using test pipes but you also get additional exhaust volume with them. If your thinking about going down the turbo road it would be worth it. I picked up some berk HFC's and have been real happy with them. Be fore warned there is a "bi*ch bolt" on the stock drivers side cat thats a big pain in the *** to get out. There are several hundred comments on the forum about this particular bolt.
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