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Originally Posted by blackjack
are the stock cats very restrictive ?? how much hp gain by just gutting them? worth the trouble ?? i already have borla exh,with the many restrictions removed,and no resonator(x-pipe)
blackjack
91/1735
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I'm not sure if anyone has done a dyno after just gutting the stock cats, but I suspect it will make a difference. The trouble with the stock system is not only the cats but the restrictive nature of the manifold design as well. So while gutting the cats will help a little, replacing everything with headers will make the greatest gains.
