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stupid question.
you want a better answer, write a better question
 

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Discussion Starter · #3 ·
ok, at what point will 4" down pipe become a restriction and need to be changed to a 5"? Is that better .Shit you could of atleast gave me a stupid answer
 

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I've seen 1200rwhp with 91mm on 03 cobra. It had a 4 inch downpipe back to 3in magnaflow. Still has the stock hellion i/c and 2.5in cold side piping.
 
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