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I recently installed dual straight pipes from the cats back with 4" tips. I was talking to a guy who works for my dad today and he said something about getting something done to the computer to help with the decrease in backpressure so that I wouldn't blow a valve. He seems to know what he is talking about with cars. Do I really need this done? It is a 1998 Ford F150 2wd
 

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Hell no!! You'll be fine since you left the cats on :bigthumb:
 
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