| From | Message |
Nelson
Dodge Dakota
8/31/2001
21:36:25
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 Subject: High Flow Cat
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Message:
I have a 99 5.2 4X4 with a set mopar headers and mopar cat back exhaust along with a K&N cold air intake and Jet Stage 2 chip with Accel coil and wires. I was just wondering if I put a high flow cat will there not be enough back pressure and cause the HP to drop?
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BlkBird
Dodge Dakota
8/31/2001
22:27:27
| RE: High Flow Cat
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Message:
I dont even have a cat anymore. There will definately not be any horsepower loss by replacing the cat with a high flow version. Id recommend Random Tech, theirs flow the best.
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Troy
Dodge Dakota
9/01/2001
09:27:42
| RE: High Flow Cat
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Message:
I too have headers (Kenne Bell) and a high-flow cat-back exhaust. I have a straight thru single in/ dual out muffler. I also have the stock cat. My understanding is that the factory cat is a high flow version. I have also heard that some back pressure is needed in a modern EFI engine, to maintain good power. I don't think there will be any hp loss by changing the cat, but I wouldn't be surprised if low-end torque dropped. I have considered changing my cat on numerous occasions, but I still have the stock one, due to what I have heard about torque loss. I have also heard that a certain amount of backpressure is needed for the computer and oxygen sensors to work correctly. Hope this helps.
2000 Dakota QC 5.9L 4x4, 3.92LS, lots of mods
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