Drivetrain OBX-Racing Header Dyno Results!
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The OBX is a 4-2-1 header, the Miltec is a 4-1 type. The mechanic told me he expect better gains when the 4 primary tubes are smaler in diameter (36mm instead of OBX 40mm). The OBX header is a 1:1 copy of the supersprint. The fitting was 1a. Does anybody know if i get more gains with a 200 cpsi metallic cat?
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Interesting observation jlm
MadMick, I'm a little confused. Your mechanic stated he would have expected better gains from smaller primarys, but the OBX according to your post is 40mm and not 36mm. Did you mistakenly switch around the sizes or are you unhappy with the dyno results? Personally I think the results are impressive as headers can move power around yielding gains so not usefull day to day.
Originally Posted by MadMick
The OBX is a 4-2-1 header, the Miltec is a 4-1 type. The mechanic told me he expect better gains when the 4 primary tubes are smaler in diameter (36mm instead of OBX 40mm). The OBX header is a 1:1 copy of the supersprint. The fitting was 1a. Does anybody know if i get more gains with a 200 cpsi metallic cat?
MadMick, I'm a little confused. Your mechanic stated he would have expected better gains from smaller primarys, but the OBX according to your post is 40mm and not 36mm. Did you mistakenly switch around the sizes or are you unhappy with the dyno results? Personally I think the results are impressive as headers can move power around yielding gains so not usefull day to day.
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So, if one wanted to leave the pre-cat inplace - for obvious EPA reasons - your header provides an improvment over the 'completely' stock unit??? Or, if one wanted to simply remove the pre-cat from the stock header - all other things equal - the stock header sans pre-cat would perform better than the OBX??? Just confirming with different words.
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My mechanic said:
Simply remove the pre-cat from the stock header - all other things equal - the stock header sans pre-cat would perform better than the obx.
I´m quite happy with the results of the obx header.
I dont believe the mechanic but i try to get another dyno graph from a friend with that modification.
Simply remove the pre-cat from the stock header - all other things equal - the stock header sans pre-cat would perform better than the obx.
I´m quite happy with the results of the obx header.
I dont believe the mechanic but i try to get another dyno graph from a friend with that modification.
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You can feel quicker throttle response and and faster upspooling. At daily driving you can use one gear higher due to the bigger torque at lower revs. The engine pulls harder at any rev. The sound is more deeper and when you close the throttle you can here nice popping and nice bangs when changing gears under hard acceleration.
Its quite a big gain for the money! For $ 175,- plus an hour of work you wont get better performance
Sorry for my bad language but I´m writing from germany
Its quite a big gain for the money! For $ 175,- plus an hour of work you wont get better performance
Sorry for my bad language but I´m writing from germany
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Would their Cooper header be worthwhile for me to buy? I already have an R Speed exhaust and Pro MINI intake, so the header seems like the next logical choice. My only concern was the EPA stuff in Ohio, but if the OEM cat can be welded on, that should satisfy the EPA testing, wouldn't you think?
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The check engine light is not on and here in germany you will pass all emission checks when using the OEM cat and precat removed. The precat is only installed due to the homologation by bmw where the car must haver propper emission values right after starting the engine a -7°C. You will go to the emission checks with a nice tempered engine so the precat is not necessary while the main cat is well heated.
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Winner!
Installed this header yesterday with the help of a welder buddy, I used the factory CAT. $165 + shipping from ebay. Cheaper than the HP Racing CAT-less header I tried and reviewed in the reviews forum.
Ladies and gents, this one is a winner in ALL respects. The fitment is PERFECT. In laying the header gasket on the flange, every primary and bolt hole lined up perfectly, no grinding or adjustment necessary. The primary holes in the flange are flush with the inner primary tubes themselves providing a nice smooth flow for exhaust. To make it fit with the factory CAT, one needs only cut the CAT off the factory header behind the weld bead (cut between weld bead and CAT). Cut as close as you can to the CAT to maintain pipe diameter consistant with the header adapter. Its attached to a Borla Sport exhaust.
While I've never seen the Supersprint in person, I'd bet the farm that the OBX is same quality. Its beautiful, and precisely manufactured. Noise level - which made my previous header a non-starter: I can't tell a difference between the OBX and factory header -- a good thing in my book! Needless to say, I'm thrilled with this buy/install. If you're considering a header, you can't go wrong with this one!
Next up, larger injectors and some fuel management... longer term, a ported head.
Ladies and gents, this one is a winner in ALL respects. The fitment is PERFECT. In laying the header gasket on the flange, every primary and bolt hole lined up perfectly, no grinding or adjustment necessary. The primary holes in the flange are flush with the inner primary tubes themselves providing a nice smooth flow for exhaust. To make it fit with the factory CAT, one needs only cut the CAT off the factory header behind the weld bead (cut between weld bead and CAT). Cut as close as you can to the CAT to maintain pipe diameter consistant with the header adapter. Its attached to a Borla Sport exhaust.
While I've never seen the Supersprint in person, I'd bet the farm that the OBX is same quality. Its beautiful, and precisely manufactured. Noise level - which made my previous header a non-starter: I can't tell a difference between the OBX and factory header -- a good thing in my book! Needless to say, I'm thrilled with this buy/install. If you're considering a header, you can't go wrong with this one!
Next up, larger injectors and some fuel management... longer term, a ported head.
#21
Join Date: Apr 2003
Location: a canyon, south Bay Area
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The price is MUCH less than others! It appears that these guys are in SF, according to eBay, and the phone number on their website...
Speaking of which, there is no info about the MINI header on their website:
http://www.obxracingsports.com/perfo...22&subCat2ID=1
Can someone confirm the size (diameter) of the tube where the cat is attached? If like the SuperSprint, it's 2.5" or 63.5 mm. Stock is 2.25"...
Thanks.
Speaking of which, there is no info about the MINI header on their website:
http://www.obxracingsports.com/perfo...22&subCat2ID=1
Can someone confirm the size (diameter) of the tube where the cat is attached? If like the SuperSprint, it's 2.5" or 63.5 mm. Stock is 2.25"...
Thanks.
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Originally Posted by TonyB
The price is MUCH less than others! It appears that these guys are in SF, according to eBay, and the phone number on their website...
Speaking of which, there is no info about the MINI header on their website:
http://www.obxracingsports.com/perfo...22&subCat2ID=1
Can someone confirm the size (diameter) of the tube where the cat is attached? If like the SuperSprint, it's 2.5" or 63.5 mm. Stock is 2.25"...
Thanks.
Speaking of which, there is no info about the MINI header on their website:
http://www.obxracingsports.com/perfo...22&subCat2ID=1
Can someone confirm the size (diameter) of the tube where the cat is attached? If like the SuperSprint, it's 2.5" or 63.5 mm. Stock is 2.25"...
Thanks.
Hope that helps. Any other questions, I'll do my best to answer.
cheers!
#23
Join Date: Apr 2003
Location: a canyon, south Bay Area
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BluMiniMe, thank you! A few us have catbacks that are 2.5", thus my question... I fabricated mine, and the center pipe is SuperSprint, with resonator, 2.5". The price of SS's header is substanially more though...
I was thinking of using an ATP stainless steel race cat that I believe jlm and possibly (I forget) Andy are using:
http://www.atpturbo.com/Merchant2/me...egory_Code=MDP
Actually, I think it's this one:
http://www.vwturbo.com/products/details.asp?id=48&cat=8
I might call these guys and see if I can visit them, and see it up close. And if I like it, save on the shipping Please do give us your drive impressions as well. You shared that sound is unchanged, but then with the stock cat, that doesn't surprise me. Thanks again.
I was thinking of using an ATP stainless steel race cat that I believe jlm and possibly (I forget) Andy are using:
http://www.atpturbo.com/Merchant2/me...egory_Code=MDP
Actually, I think it's this one:
http://www.vwturbo.com/products/details.asp?id=48&cat=8
I might call these guys and see if I can visit them, and see it up close. And if I like it, save on the shipping Please do give us your drive impressions as well. You shared that sound is unchanged, but then with the stock cat, that doesn't surprise me. Thanks again.