NA Motor Discussions regarding N/A KA24E, KA24DE, and SR20DE

obx header

Old 06-03-2009, 10:18 PM
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obx header

i have an obx header that i haven't installe yet. i'm waiting to get a testpipe and cat back before i install it. the problem i have is that the outlet on the header has an inside dia of 2 1/4 in. but all the testpipes and afordable catbacks i've found say that they are 3 in.

willa 3 in work?
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Old 06-04-2009, 06:57 PM
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A friend of mine said it should work, because the flanges should be the same. is this true??
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Old 06-04-2009, 09:03 PM
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yes the flanges are the same, but did your "friend" mention that by replacing the cat with a test pipe you'll only see about a 3hp gain? not only that but you'll also be contaminating the environment.
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Old 06-04-2009, 11:25 PM
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only 3 hp???shouldn't it be more because the exhaust is free of the restriction of the cat??

i grew up on classic v8s and want to use some of those same ideas
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Old 06-05-2009, 08:26 PM
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Your lucky to see 3-5hp from a aftermarket exhaust mani for a NA KA. I myself just bought a HOTSHOT from a friend and from what i read on a dyno chart on another forum is the the hotshot proved the most hp out of DC Sports, OBX ect...the guy tested them all with charts.
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Old 06-05-2009, 09:38 PM
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+1

Your only going to see a 1-2whp increase

I also believe HS Runners are 1.25" and the outlet should be 2.5" if I'm not mistake, dont know the OBX size besides the outlet is 2.5" also

this was a test done on a MX-5 (Stock was 104)


Last edited by 240-kid; 06-05-2009 at 09:41 PM.
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Old 06-23-2009, 09:38 PM
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Originally Posted by jramosthe1st! View Post
yes the flanges are the same, but did your "friend" mention that by replacing the cat with a test pipe you'll only see about a 3hp gain? not only that but you'll also be contaminating the environment.
Not only that but if his engine is OBD2 it will throw a cell and run pig rich.

Originally Posted by slappy View Post
I myself just bought a HOTSHOT from a friend and from what i read on a dyno chart on another forum is the the hotshot proved the most hp out of DC Sports, OBX ect...the guy tested them all with charts.
Who the f$ck filled you with that non sence. HOT SHOT is a good header, but I have a DC sport header, and no one with the HOT shot header has beaten my dyno on the internet.
Besides how did you get that hot shot header? Hot shot has been out of business for over a year.
Got a link?

Last edited by BigVinnie; 06-23-2009 at 09:43 PM.
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Old 06-26-2009, 09:40 AM
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well vinnie your engine is awesome so of course no one is gonna beat your header dyno i know that a header will increase hp but you gotta add other mods to it to get the gains your looking for.... one question vinnie i have a early 95 zenki if i punch out the cat (clogged) will it throw a code for me as well?? i have 2 o2 sensors i believe..?

thanx Eric
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Old 06-28-2009, 06:24 PM
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Originally Posted by SmokedZenki View Post
well vinnie your engine is awesome so of course no one is gonna beat your header dyno i know that a header will increase hp but you gotta add other mods to it to get the gains your looking for.... one question vinnie i have a early 95 zenki if i punch out the cat (clogged) will it throw a code for me as well?? i have 2 o2 sensors i believe..?

thanx Eric

Yes...
You will need a high flow cat. You can't used a punched cat.
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Old 06-28-2009, 06:54 PM
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okay thanx vinnie

Eric
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Old 06-01-2011, 09:55 PM
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Originally Posted by 240-kid View Post
+1

Your only going to see a 1-2whp increase

I also believe HS Runners are 1.25" and the outlet should be 2.5" if I'm not mistake, dont know the OBX size besides the outlet is 2.5" also

this was a test done on a MX-5 (Stock was 104)

I had in mind that some nice pair of headers would have added maybe 10 hp to a NA KA. from what I have been reading there is only minor hp gains from top brand headers. This is a dumb question but would headers +intake+ exhaust add a significant amount of hp?
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Old 06-03-2011, 12:48 AM
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so many factors determine HP guessing at it is not good just install it tune it dyno it drink beers
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