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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 12-09-2012, 09:50 AM   #1
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Join Date: Apr 2011
Location: Long Island, NY
Posts: 1,751
My Ride: 02 330i

Can anybody answer a few questions for me??
I recently purchased some nice headers,and exhaust for my 330. I bought all new gaskets and hardware for the install. Now, a lot of people are telling me that because I'm disconnecting SAP,car is going to run really rough till it warms up. Any truth to this? If so, how long is car going to run rough? does it hurt the motor? After lots of $$$ ,now I'm debating installing new headers and exhaust..
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Old 12-09-2012, 10:09 AM   #2
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The secondary air pump is a post-combustion device, so I don't believe disconnecting it would cause any roughness. It injects fresh cold air to lean out the stream of exhaust entering the cats to let them warm up quicker on cold starts, so that the cats are operating at normal efficiency quickly and your cold start emissions don't go overboard. It's an emissions compliance device, so I don't think you'll notice any difference in smoothness. That said, I've never tried disconnecting it on any car I've owned, so I'm curious as well, to hear from someone that's actually done this. Fact is, the SAP operation is closely tied to the VANOS strategy, and one may not work well without the other, so there's a possible effect on VANOS operation there..

E92 convert. BMW Fanatic.
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Old 12-09-2012, 10:13 AM   #3
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Last winter , I had some trouble with SAP system ( broken vaccuum line) and the car was "shaky" upon a cold start. .I am thinking that it will run "shaky,rough" till the motor warms up. I really need to hear from somebody that lives in the Northeast and has headers installed how their car runs.
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Old 12-09-2012, 10:49 AM   #4
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you're in ny, as am i, i also wanted headers, and i bought em, got em jet hot coated, and they have been in my shed for years, gota get around to selling them

you wana fool with emissions move out of ny

it's getting harder and harder

now, if the cat isn't in the stock location, which it is impossible to do on these cars , you run the risk of them busting your chops

figuring in the cash for the work and the opening of a can of worms, i decided on a magnaflow cat back and call it a day

"if polarity comes from protons, does morality come from morons?"

Originally Posted by russ330 View Post
"Mommy and Daddy are getting a divorce now because wasp9166 had to piitb with Mom."

Last edited by wasp9166; 12-09-2012 at 10:50 AM.
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Old 12-09-2012, 12:00 PM   #5
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I am getting the car inspected this month,then i was going to install the headers. i have o2 sim for CEL. and next year I have a hook with stickers (just cost $$$)
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Old 12-09-2012, 12:08 PM   #6
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just leave it in there
you'll get a service engine soon light if you unplug it
ive had headers for a couple of years and i have no running issues with it still in there
yes since you dont have cats its pretty much useless but its not going to hurt leaving it in there
there is a sap sim out there so that you can avoid the s.e.s light but if i recall its around $250
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