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Old 12-25-2002, 10:32 PM   #1
bmwzack
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headers?



I was wondering if anybody knew anyone who makes performance headers for my e30 325. I don't want to spend a whole lot. Reply if u know anyone who makes good ones. Thanx.
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Old 12-27-2002, 03:07 AM   #2
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well bavarian auto has them the sites www.bavauto.com
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Old 12-27-2002, 05:45 AM   #3
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I think bekkers has them too but not sure

http://www.bekkers.com/cgi-bin/miva?...egory_Code=BMW
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Old 12-27-2002, 06:44 PM   #4
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I got my set from Ireland...

Pleased with them but no significant gain.
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Old 12-27-2002, 08:46 PM   #5
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Genie! They custom make them for a fair price. You should talk to Randy (empowered) or Darryl (the brown guy) about it. If you want high end get a 4-1 style header, if you want mid range and maintain the low end torque go for 4-2-1 style.

Also, you guys are aware that even with a header and cat back exhaust set-up if your still using the stock cat you won't see any gains. Using the stock cat with a header is almost useless. You should either hollow out your cat, get a racing cat or remove it completely. I recommend keeping your stock cat and hollowing out or purchasing a racing cat, this way when emissions testing comes around you still have to stock cat you can replace.

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Old 12-27-2002, 08:52 PM   #6
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that is what i did

Headers to a Y then 2 1/2" to a Hi Flow Cat to a Hi Flow Muffler

Sounds really good..
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Old 12-28-2002, 03:04 AM   #7
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Quote:
Originally posted by The Sly
that is what i did

Headers to a Y then 2 1/2" to a Hi Flow Cat to a Hi Flow Muffler

Sounds really good..
Is the exhaust a cat back as well? It would be useless to have just the muffler but use the stock diammeter piping. You should make sure that the headers and exhaust piping match up properly as well.

Honestly, I think you did something wrong. I've driven car's where headers have been swapped into M50's and M42's, both engine's show significant gain in the high end RPM's (4500RPM). Maybe the header you got leaks or is poor quality?

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Old 12-28-2002, 03:18 AM   #8
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I actually had the setup done at a speed shop.
It has nothing stock...All done with with new pipes.

The boys were calculating the exhaust pipe should be 2 1/2"
I wanted to go with 3" but they said it was not needed for my aplication.

When i got it done at first I did not have the Hi Flow Cat.

I found it very loud and the A/F meter was showing the rich / lean
to be over to one side alot longer then usual.

Too little back pressure!
So I then installed a Hi Flow Cat and this got the noise level down a bit and also it added a bit more back pressure.

Now my A/F meter show better results.
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Old 12-28-2002, 03:22 AM   #9
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AS for the gain ....This was done when the stock engine was in.
Gain was not noticable or very little.

NOw with the Stroker, HI compression setup, cam,ported head N.O.S. etc...
It runs just fine to me.
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Old 12-28-2002, 05:25 AM   #10
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manufacturers that carry headers for the M20: (that I know of)

Stahl
Genie
Supersprint

Don't expect much HP gain for the average price of them ($1000) infact, you typically loose some torque too!
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Old 12-28-2002, 04:56 PM   #11
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Quote:
Originally posted by The Sly
AS for the gain ....This was done when the stock engine was in.
Gain was not noticable or very little.

NOw with the Stroker, HI compression setup, cam,ported head N.O.S. etc...
It runs just fine to me.
Sounds good. For my M42 engine there isn't much torque to loose in the first place and all the power is up high in the RPM band, so I figure might as well make it all high end like a race car.

I am a little worried about the noise level though as you mentioned in your previous post. But once I heard the SS headers on my friend's M50 w/o cat and full cat back exhaust it sounds very quiet.

Have you tried using any fuel pressure regulators to compensate?

thanks,

Bryan
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Old 12-28-2002, 04:57 PM   #12
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Quote:
Originally posted by empowerd
manufacturers that carry headers for the M20: (that I know of)

Stahl
Genie
Supersprint

Don't expect much HP gain for the average price of them ($1000) infact, you typically loose some torque too!
Randy, could you please tell me where I could pick up a set of Genie headers and for approxmiately how much?

thanks, much appreciated.

Bryan
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Old 12-28-2002, 05:10 PM   #13
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Quote:
Originally posted by Autotechnica
Randy, could you please tell me where I could pick up a set of Genie headers and for approxmiately how much?

thanks, much appreciated.

Bryan
i got my genies from marcor motorsports 1-800-263-8621... and paid around 1000.00.............. there in the gta
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Old 12-28-2002, 05:13 PM   #14
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Quote:
Originally posted by Autotechnica
Sounds good. For my M42 engine there isn't much torque to loose in the first place and all the power is up high in the RPM band, so I figure might as well make it all high end like a race car.

I am a little worried about the noise level though as you mentioned in your previous post. But once I heard the SS headers on my friend's M50 w/o cat and full cat back exhaust it sounds very quiet.

Have you tried using any fuel pressure regulators to compensate?

thanks,

Bryan
Yes i did put in a 4bar fuel pressure regulator and E36 injectors for the added Hp of the Stroker
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