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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 10-06-2009, 09:58 PM
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Default Cuttin off the cats?

ya so ive been considering cutting off the cats and just putting a straight pipe there so i have a make shift exaust. I know I know its illegal but what u guys think? Do you think it will sound good?
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Old 10-06-2009, 10:02 PM
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It may sounds good, but the truck may not like it. Should do some research and make sure the o2 sensors won't be affected by it.
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Old 10-06-2009, 10:14 PM
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yeah, and that might actually make you lose power because of the loss of backpressure...
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Old 10-07-2009, 12:12 AM
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I wouldn't recommend it either. The fuzz is getting wise to trucks like that and having them towed if they pull you over (they like to check if your exhaust is loud). In addition to the problems that may arise from your O2 sensor and the above mentioned backpressure issues, I'd probably throw highflow cats in instead.
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Old 10-07-2009, 01:02 AM
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Highflow cats work good and make your truck sound sweet.
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Old 10-07-2009, 01:18 AM
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Quote:
Originally Posted by CHILLZ HEMI View Post
yeah, and that might actually make you lose power because of the loss of backpressure...
Just want to clear this up, That statement is a myth and a myth only, it is greater to have less backpressure on the cylinders during an exhaust stroke, thats why headers were invented to actually make a vaccum from the combustion chamber during an exhaust stroke, the easier it is to move spent gasses the more power the engine will make. What it can potentially do is make you run exccessively rich in 3rd gear because the pcm already enrichens the mixuture in 3rd gear to protect the cats from a heavy load as well as pistons. Removing the cats could make the pcm adjust to protect them even further because they are now gone and upstream and downstream voltages will no longer match those of a system with cats. This can be tuned "out" with a custom tune like SCT or Diablo
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Old 10-07-2009, 08:27 AM
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Not sure about Dodge but many late model vehicles require exhaust back pressure to operate the egr system. If it doesn't see back pressure on the egr valve it never opens so the pcm doesn't see that lean condition and thus goes into "limp mode" and turns on the MIL. I did install straight duals on a Suburbon 350 V8 and have not been able to rectify that situation, yet. Not that u will have this problem but something to consider.
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Old 10-07-2009, 09:35 AM
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i had header and no cat with a straight pipe exhaust on my eclipse. if it's all the same with the 4 cylinder. it ran a lot smoother and faster than stock. i was throwing an o2 senor code but just deleted it and never had any more problems.
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Old 10-07-2009, 10:23 AM
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Quote:
Originally Posted by Johnnyhemi View Post
Just want to clear this up, That statement is a myth and a myth only, it is greater to have less backpressure on the cylinders during an exhaust stroke, thats why headers were invented to actually make a vaccum from the combustion chamber during an exhaust stroke, the easier it is to move spent gasses the more power the engine will make. What it can potentially do is make you run exccessively rich in 3rd gear because the pcm already enrichens the mixuture in 3rd gear to protect the cats from a heavy load as well as pistons. Removing the cats could make the pcm adjust to protect them even further because they are now gone and upstream and downstream voltages will no longer match those of a system with cats. This can be tuned "out" with a custom tune like SCT or Diablo
Oh, well thats good to know then, ive never heard of that...Either way, I wouldnt just cut them off, put high flow cats on and stay legal, or like it was said above, you get pulled over, plan on walking home....
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Old 10-07-2009, 10:26 AM
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High flow cats!
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