cat delete gains and 5.0 stock catback - Mustang Evolution

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Old 05-14-2013, 02:22 AM   #1
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cat delete gains and 5.0 stock catback

I have a friend offering me his 5.0 stock exhaust system-mid pipe-everything. if I do this I wanna eliminate my cats also? is this possible? and what will my gains be like? any back pressure loss? loss of torque? thanks
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Old 05-14-2013, 04:24 AM   #2
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Eliminating the cats will get you in trouble; maybe not now, but when you go to sell or trade in the car. Its illegal to sell or trade a car without the cats. Either a provate individual that you sold it to can come back after you and force you (by law) to either take back the car at full price (even if you sold it "as is"), or a dealer can retract a deal made. Both of these can also net you a 30K fine by Federal law, regardless of local laws.

As to if it nets you any additional performance, I doubt any significant gains to make it worth removing them. If you have a V6, the 5.0's will require some end tube modification, as the 3.7 V6's exhaust is smaller in diameter than the late model 5.0's.
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Old 05-14-2013, 09:10 AM   #3
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Don't delete cats and get a bigger mid/over axle pipe. You'll lose what you're trying to achieve, which is no positive or back pressure. This will make a negative pressure in the pipes and won't allow the engine to eject the fumes, allowing them back into the headers and engine. If you remove the cats, stick with the same diameter mid/axle pipe.

And I agree with the above. Fines that big are not worth it. At all...
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Old 05-14-2013, 10:42 AM   #4
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I understand that. what about a test pipe? it has sensers that will pass-jus not the visual. but what do you guys recommend? a catback?
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