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Problems with straight pipes..

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Old 05-22-2010, 11:40 AM
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Default Problems with straight pipes..

So i was thinking about removing my cat and putting in a straight pipe.. But i was talking to a guy at an exhaust store. He said that the increased airflow would make my check engine light come on, and my performance would suffer... BUT he also said he had heard of a simulator that could trick the computer to think the cat was still there. Can anyone help me find this simulator? Or does anyone know anything about doin the straight pipe mod?
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Old 05-22-2010, 11:53 AM
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The rear O2 sensor will still pick up fuel in the exhaust because there is no cat there to burn them up, are you legally required to have a cat in your area?
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Old 05-22-2010, 12:00 PM
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No, there not required here. So does that mean my check engine light will come one?
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Old 05-22-2010, 12:50 PM
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Originally Posted by sselover View Post
No, there not required here. So does that mean my check engine light will come one?
Yes. You can buy a sensor delete or if you know someone who has a tuner, you can turn that off.
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Old 05-22-2010, 01:51 PM
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Is there any truth behind the statement that performance will suffer?
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Old 05-22-2010, 02:07 PM
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thats what the guys at 21st century exhaust said... i thought itd be the opposite...
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Old 05-22-2010, 03:40 PM
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yea a free flowing exhaust is good until a point. with straight pipes you can get too much flow which could cause you to lose some down low torque. i rode around the block with no muffler before i put my borla muffler on and man it was loud! pretty cool, cant lie.
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Old 05-22-2010, 03:43 PM
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U loose torque with no back pressure
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Old 05-22-2010, 04:34 PM
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Originally Posted by raptor660 View Post
U loose torque with no back pressure
yup, with the supercharged motors i dont think you really need back pressure but his isnt supercharged so yea.
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Old 05-22-2010, 05:20 PM
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even with the SC you still need some backpressure, now with turbos you want to eliminate as much pressure as possible because more flow= more boost= more power!
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