i heard that the stock jdm header works better than any after market header because its 2.5, and after markets like DC are 2.25? Don't know and need some help? 
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jdm header from what?
1993 Honda Accord LX 2004-2009
1996 Honda Civic LX 2009-2012
2012 Kia Optima LX 2012-2013
2010 Honda Accord EX-L V6 2013-2018
2007 Honda Fit Sport 2017-2017
2018 Honda Accord EX-L 2.0T 2018-20XX
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to an H22aComment
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You might wanna check the ammount of *restrictive airflow* as the H22 header might not be a tubeular, the T-304 SS headers can be better even though they are smaller, cause of the way they flow... the stock H22 header could be more restrictive if its a cast header. Assuming this is the H22 header, it doesnt look all that great... i would hit up a decent DC sports header to that... If you swapped an H22, im sure ya got some cash for a decent header. Dont go cheap.
Then again, the JDM header to the F22, which i believe is the F22A (uses the same E-M to the A4) motor, is the best tubular header for the F22A's. We need more info on what ya got bro.90 Accord EX F22a1 Auto R.I.P.
2011 Mazda 3 Hatch 2.5L GS sport HELLO!Comment
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no stock header suck. period. except the a4 header.
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moved onto volvos. dont know how that happened, just didComment
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Not necessarily true. The jdm header and downpipe did surprisingly well on the dyno as tested on a thread somewhere on here where it was up against a dc header, smsp header and another one. As for the DC header, if you want a carb legal one, 2.25" is the way to go HOWEVER, they offer a 2.5" collector one as well that is not carb legal and that one was not tested on the dyno.
...adjust accordinglyComment
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the stock jdm h22 header sucks imo. i cut mine off right at the flange where the top and bottom half meet and compared it to a dc header. the stock one was extremely restricted where the two halves meet. i would take the dc hands down for aesthetics and small performance gains over the stock one. if you are looking for bigger power gains look up smsp and rmf.Retired 1990 Accord LX Coupe
Project 240SX
Vouches: Bought from: smseagren83, phatdoughnut, uk - accord, lucid, iamnemo, accord_inspire, 2point6, chopstickz, djcaz_aom, roskoOriginally posted by chillin943anyone kno if i can just make a hot wire for v-tec off the horn??Comment
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I would take the jdm over the dc. For the little power DC gains its not worth paying the price. The JDM you can hack the collector and do the 2.5 collector mod with the oem look. Pretty sure you will still gain a decent amount with that setup. BTW the jdm h22 header is tubular whoever was curious about it.
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how about if i go with a megan header and down pipe?Comment
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you're better off sticking to jdm stock. Ebay headers such as megan blah blah are a waste of money. Most beginners post up "what's the best header" crap and opt for obx and such. Search around, you'll get all the answers you need.
...adjust accordinglyComment
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Yep so true. The JDM downpipe needs some minor hacking as I recall. The flange isnt the same. The USDM downpipe bolts on but the collector is slightly smaller.Originally posted by LinX
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big fan of dc sports myself.War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself.
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