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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 12-30-2004, 09:42 AM   #1 (permalink)
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I have a rotted cat, and instead of paying a couple hundred for a new used one i wanted to go ahead an run a two and a half in single pipe through the exhaust into a new muffler like a dyno max, i was wondering what the side effects of this would be i already have hesitation when i accelerate and i think its because of the exhaust i was wondering if opening the exhaust like that will have any dramatic results on the motor in a bad way. i have a 85 535i straight six. Thanks
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Old 12-30-2004, 10:15 AM   #2 (permalink)
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You will be getting rid of the much needed back pressure that your engine must have!
You will lose most of your low end torque.
And you can burn up a valve.
Why don't you just get a high flow cat or even something cheap just for the time being until you can get the right one?
Th eguy I got my '86 from had taken the cat off. When I replaced it I couldn't believe the low end I all of a sudden had.
You will be much happier if you just put another cat on it!
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Old 12-30-2004, 01:47 PM   #3 (permalink)
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Better check on your state's smog check process. Here in California, you could never get away with that...they'd fail you for 1) removing the cat, 2) modifying the original exhaust system and probably 3) spewing too much pollution out the back.
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Old 12-30-2004, 02:49 PM   #4 (permalink)
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you would have HUGE torque loss. and lets face it the 535 needs that torque
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