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HFCs are High Flow Cats... Test pipes are just strait pipes... you will gain 2-3 more hp with TPs but you will through a code and your SES light will come on... HFCs you wont have any trouble with the SES light...
Oh and TPs will have the "smell" that everyone loves....hahah
Whats the difference between Berk's HFCs and Test pipes...
JY
Also test pipes are illegal in all 50 states (except for "show or off road use only"). HFC's are legal in 49 states. Some shops will install HFC's but not test pipes.