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Forced Induction Forum
Discuss supercharging, turbocharging and even nitrous and water injection here.

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Old 03-05-2017, 08:33 PM   #1
malcolmcrane33
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Need advice! 330i supercharhed exhaust

I just recently purchased a 2001 supercharged 330i and need advice on what to do with exhaust. I dont have too much to spend on it and need to fix the back pressure. I was thinking about getting some stainless steel headers without cats and deleting resonators. I dont know what else to do from there. I would like to keep it under $700

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Old 03-05-2017, 09:24 PM   #2
hodgkinsc330ci
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"Fix the back pressure"?

If you want catless headers, be prepared for the emissions ordeals if your state has any, and go with a quality E-Bay seller or Bimmerbrakes. As for a full exhaust, you could get a Borla rep for about $600. That's the setup my friend's S/C ZHP has. Together that'll run about $900 or so. It doesn't really get much cheaper than that.

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Originally Posted by lingon300k View Post
[BMW Motors] Advertising has somehow convinced people that they're different. That they're made by magical Dachshunds who only eat special bratwursts made by virgins in an undisclosed magical spot inside of the black forest that can only be accessed via a special hydrogen powered BMW helicopter.

Last edited by hodgkinsc330ci; 03-05-2017 at 11:04 PM.
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Old 03-05-2017, 09:40 PM   #3
malcolmcrane33
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Originally Posted by hodgkinsc330ci View Post
"Fix the back pressure"? What, did you buy it with straight pipes?

If you want catless headers, be prepared for the emissions ordeals if your state has any, and go with a quality E-Bay seller or Bimmerbrakes. As for a full exhaust, you could get a Borla rep for about $600. That's the setup my friend's S/C ZHP has. Together that'll run about $900 or so. It doesn't really get much cheaper than that.

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The car is pushing 280hp at the wheels so about 330hp at the crank. The headers and exhaust is all stock and the car is giving some codes saying there is a problem with the o2 sensors after the cats and when coasting the car goes into limp mode. I would think there must also be back pressure because the stock exhaust system doesnt allow for very much airflow when the car is tuned and s/c.

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Old 03-05-2017, 10:59 PM   #4
hodgkinsc330ci
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I'd look at taking your car to a local tuner to get the exhaust and motor tuned for your needs. I'm no expert, but to my knowledge, S/C motors shouldn't differ too much from N/A motors as far as exhaust tuning goes. You're gonna want something that gives you plenty of flow (reducing backpressure is always good, you'll always make power) but is designed properly to take advantage of scavenging effects which will ensure you aren't losing torque.

Read up on back pressure and exhaust systems and tuning. If you're looking for a more definitive answer, I'd suggest taking your questions to the F/I forum on here. I'm sure you'll find the help you need there. Lots of knowledgeable people around here!

Edit: The codes you're getting shouldn't be caused by any sort of "back pressure" issue. Either you're running too lean or too rich, or your sensors need replaced. Read the codes and look 'em up on here, see what others have done to fix the issues you're having.

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Quote:
Originally Posted by lingon300k View Post
[BMW Motors] Advertising has somehow convinced people that they're different. That they're made by magical Dachshunds who only eat special bratwursts made by virgins in an undisclosed magical spot inside of the black forest that can only be accessed via a special hydrogen powered BMW helicopter.

Last edited by hodgkinsc330ci; 03-05-2017 at 11:02 PM.
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Old 03-12-2017, 08:12 PM   #5
rkneeshaw
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Quote:
Originally Posted by hodgkinsc330ci View Post
Borla rep for about $600.
Borla rep? Stainless mandrel bent with borla mufflers? Link?
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Old 03-12-2017, 10:07 PM   #6
hodgkinsc330ci
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It's right here: http://m.ebay.com/itm/162269234026

Says it's stainless steel, and my buddy said it even comes with a lifetime warranty.

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Quote:
Originally Posted by lingon300k View Post
[BMW Motors] Advertising has somehow convinced people that they're different. That they're made by magical Dachshunds who only eat special bratwursts made by virgins in an undisclosed magical spot inside of the black forest that can only be accessed via a special hydrogen powered BMW helicopter.
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Old 03-15-2017, 05:01 PM   #7
rkneeshaw
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Interesting, thanks. Looks exactly like the Borla, in almost every way. Thanks for sharing
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Old 04-02-2017, 05:41 PM   #8
Alpine-E39
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OP. If I was you I would not remove the resonators if this is a DD.
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Old 04-08-2017, 12:00 PM   #9
randomdude
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It was my understanding that the ZHP exhaust flows pretty well, Can anyone verify this?
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Old 04-08-2017, 07:54 PM   #10
rkneeshaw
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It was my understanding that the ZHP exhaust flows pretty well, Can anyone verify this?
I think that is probably very true, but I don't have any data to back it up unfortunately.
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