I had a friend tell me new headers decrease hp and torque. Is that true?

2002 TOYOTA CELICA
105,000 MILES
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CWHITY777
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I am looking at installing some after market headers on my car. Along with a whole new exhaust. I was just wondering about what my friend said because if it is true I wont do it. Also, if I installed headers that aren't street legal, how would I get caught?
Mar 20, 2012 at 5:11 AM
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