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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Obx Headers for e90?



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      06-01-2010, 09:30 PM   #67
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How much are the headers themselves? Plus new header gaskets etc...

What's the estimated hp and tq gains on the OBX? I assume no more than 15-20hp

Anyway, keep us informed :-)

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Originally Posted by Craven 328 View Post
I can do the headers for under 350$, install looks to be a 7-8 on the scale of PITA lol.

but I will cross that bridge when it comes, im waiting to place an order on them til friday, if people want to jump in with me I can offer you a better rate since I get a better price the more units I take.
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      06-01-2010, 09:42 PM   #68
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Quote:
Originally Posted by IB6UB9ok View Post
How much are the headers themselves? Plus new header gaskets etc...

What's the estimated hp and tq gains on the OBX? I assume no more than 15-20hp

Anyway, keep us informed :-)
~350$, the sims are on top of that.. 15hp is a lot of power for us lol
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      06-02-2010, 02:25 AM   #69
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Just in case you guys didn't already know.
http://www.horsepowerfreaks.com/perf...xhaust/Headers
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      06-02-2010, 05:46 AM   #70
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$1400 for 10whp.
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      06-02-2010, 06:49 AM   #71
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Quote:
Originally Posted by lux.sh View Post
$1400 for 10whp.
BMW power is always expensive. You do the maths..

335 - 328 = 70HP

I think it works out at $100 per HP.
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      06-02-2010, 11:35 AM   #72
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1400 is too much for headers, check out the NA vendor section and see whats up
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      06-02-2010, 02:25 PM   #73
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Quote:
Originally Posted by John_01 View Post
BMW power is always expensive. You do the maths..

335 - 328 = 70HP

I think it works out at $100 per HP.
335 to a 328 involves more than just power increase.
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      06-02-2010, 04:39 PM   #74
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Quote:
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What you guys need to do is install an O2 Sim before you slap on your headers.
Why do you need O2 simulators? O2 sensors are located on the OBX headers as on the original manifold before the primary cats.
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      06-02-2010, 04:39 PM   #75
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Why do you need O2 simulators? O2 sensors are located on the OBX headers as on the original manifold before the primary cats.
because it will throw a code without the cats.
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      06-03-2010, 07:26 AM   #76
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Quote:
Originally Posted by Craven 328 View Post
because it will throw a code without the cats.
OK, I thought that the secondary sensors are located behind the secondary cats. I just checked and I was wrong.
Any recommendation where to get the simulators?
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      06-03-2010, 12:19 PM   #77
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From me lol
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      06-03-2010, 01:00 PM   #78
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Does anyone know if a secondary cat delete help in power or even sound? Since the headers will delete the primary cats, i mind as well remove second also. will doing this cause me to fail inspection?
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      06-03-2010, 01:04 PM   #79
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you wont smog without the cats, so the secondary cat are just gravy, cut them or leave them. Either way with headers you wont Smog.
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      06-06-2010, 10:08 PM   #80
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Hello all this is my first post in this forum. I just got my 325i at the auction about a month ago. I've been a turbo Volvo tuner for over a decade and this is my 1st BMW. I'm excited to start modding it. I had a OBX downpipe and exhaust on my Volvo. It was great sound wise. The welds look a bit primitive but they are solid. I ragged on that car hard I was pushing 350 whp. OBX products are solid.
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      06-06-2010, 10:09 PM   #81
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I'm going to purchase the OBX headers from ebay and craven i'll be needing the o2 sims please. PM me
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      06-06-2010, 10:15 PM   #82
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I can beat that ebay price any day.... hope you get the PM first lol
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      06-06-2010, 10:21 PM   #83
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what o2 sims are you selling?
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      06-06-2010, 10:23 PM   #84
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Im having some done up for me by terry @ BMS but we have to do the final tweaking when the headers are installed. im placing the order by tuesday for them and will be done friday
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      06-06-2010, 10:28 PM   #85
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If thats the case. I'll wait for you to finish the tweaking b/c I want a good working product. I hate the CEL. Let me know when your done. My brother has a shop All Out Performance by tamiami air port you can send it there. That's where I'm doing the install, for freezy neezy.
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      06-06-2010, 10:34 PM   #86
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Quote:
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If thats the case. I'll wait for you to finish the tweaking b/c I want a good working product. I hate the CEL. Let me know when your done. My brother has a shop All Out Performance by tamiami air port you can send it there. That's where I'm doing the install, for freezy neezy.
lol ok, ill send you a PM.

if you want the headers cheaper then the ebay price, drop me a PM
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      06-08-2010, 11:40 PM   #87
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Headers are ordered! should be here friday for install this weekend!
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      06-13-2010, 01:40 AM   #88
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Im interested with the results. If everything works out im game!
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