Duals On Expy Help
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Duals On Expy Help
hey im getting fake duals i guess you would call um(one pipe splitting into 2)_ and i want it to be as loud as it can be. as of know im just gonna run straight pipes but it has 4 cats on it. and the exhaust guy said he cant take um off first becuase its illegal and second it would run real ****ttttty. but other people have told me i can remover one? idk but i just want it to be a real nice low ton loud sound. sop soes anyone know the answers to any of these questions and also how loud wil it be (5.4L)?
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From: Mesa
Dual it out after the cats... Use something like this: http://www.magnaflow.com/02product/s...ne=main&id=854
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From: Rio Rancho USA
Originally Posted by bigexpo
so if i take the cats off it wont affect my perf or make it run ****ty. because there is an o2 sensor after the 2 cats on each side of the exaust
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so if i take the cats off and get an mil eliminator it will run the same but just with no cats and be louder
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From: Rio Rancho USA
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From: Reed Point, MT
The engine's computer (PCM) uses information from the pre-catalytic convertor oxygen sensors to determine rich/lean fuel trim values. The post-catalyst sensors' only function is to monitor the efficiency of the catalytic convertors. This is OBD2 mandated. If the catalytic convertors are removed, the post-catalytic sensors will mimic the pre-cat sensor readings and the check engine light will come on due to a perceived efficiency problem with the cats.
MIL eliminators are installed to send the PCM a voltage reading that would mirror a 'healthy' catalytic convertor. This would be in the 350-550 millivolt range and fluctuate between those voltages slowly.
There is no harm in removing the cats (besides emissions,duh) that will cause a driveability issue. The CEL will come on, but you can always use it as a backlight for a family picture or something.
Cody
MIL eliminators are installed to send the PCM a voltage reading that would mirror a 'healthy' catalytic convertor. This would be in the 350-550 millivolt range and fluctuate between those voltages slowly.
There is no harm in removing the cats (besides emissions,duh) that will cause a driveability issue. The CEL will come on, but you can always use it as a backlight for a family picture or something.
Cody
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From: Reed Point, MT
I think you'd get an OK tone from the exhaust if you left the cats. Obviously it's not going to be super-loud. However you have to think that if you have no catalytic convertors and no mufflers, just pipe, you're going to be lucky if you get a decent tone from the exhaust. Chances are without any kind of resonating device, all you'll get is a nasty "blatty" tone and a real crappy sound at idle.
Cody
Cody
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