stock vs aftermarket headers

[tutsuo]

Well hold on now, when i had my F22A1 i bought an ebay header back system and i definently felt more power. Though it might be a tiny gain you feel it.

[jhoff]

The only header that has been known to make massive power gains is Bisi's right?

[oni_cb7]

Most likely no, unless you're for some reason running a really lean mix. The wrap will just make the header temperature raise since it's not getting "cold" air from the outside (not really cold cold air but you get the point, lower than the exhaust gases).

Not necessarily true. This is why our header comes with a heat-shield (to keep the heat near the header [the heat-shield also keeps the heat from spreading to the rest of the engine bay]). Hot air travels and flows faster than cold air. Therefore, header wrap will allow heat to stay in the header; which allows the exhaust gases to be hotter and flow better. This is especially useful if someone wants to remove their heat-shield for the header. However, I do not see this improving performance much, only keeping the engine bay cooler.

[Audiojack]

Not necessarily true. This is why our header comes with a heat-shield (to keep the heat near the header [the heat-shield also keeps the heat from spreading to the rest of the engine bay]). Hot air travels and flows faster than cold air. Therefore, header wrap will allow heat to stay in the header; which allows the exhaust gases to be hotter and flow better. This is especially useful if someone wants to remove their heat-shield for the header. However, I do not see this improving performance much, only keeping the engine bay cooler.

A heatshield works, yes. But a wrap will be way too tight around the header, which then can't get rid of excess heat at all. In some installations the header can get so hot that it nears melting point. A ceramic heat insulation would be better to allow for the "breathing" of the header. Of course you could wrap it but that would shorten the life of the header for a minimal gain...

[illinois_erik]

The only header that has been known to make massive power gains is Bisi's right?

on what motor?
<-- going hytec tri-y to 3" on an H

[Accord problems]

Well hold on now, when i had my F22A1 i bought an ebay header back system and i definently felt more power. Though it might be a tiny gain you feel it.

that there is also known ass a but dyno . just stick with what you have and save your cash .

[jhoff]

Ive herd that on an a stock F series, the bisi header has been known to gain over 13hp to the wheels, from what ive read.

[BurtonRiderT6]

Lets not forget that if you don't wrap it correctly you will see no gains or see damage. Too loose does no good, too tight and you can crack the header.

[91cbseven]

15 whp sounds great but is that without a tune? I heard the header won't help that much without a new tune.

[oni_cb7]

15 whp sounds great but is that without a tune? I heard the header won't help that much without a new tune.

From the thread for the bisimoto header group buy...

"211,046 miles

87 octane

15.5 ft/lbs at 1560rpms

26.9whp at 6012 rpms

8.5whp at 5000-5200rpms

12.2 ft/lbs at 2700rpms

Complete bolt on, un-tuned, to stock Catalytic converter"


However, I heard a lot of people had problems with exhaust leaks with this header. That's what I heard, so I cant say for sure.

[jhoff]

15 whp sounds great but is that without a tune? I heard the header won't help that much without a new tune.

I have no ideal, I just see a few threads about it. Looks like if your serious about power on F22, the Bisi header is a good place to start.
It seems like Bisi is fixing his mistakes on the header, if there are any.

[91cbseven]

8.5 @ peak is pretty good and on a stock converter I'm sure the tone would be great too.

[koslauj]

Since you've stated you have the a6 with the stock header, i'd recommend saving your money and putting that towards something much more meaningful. For a quality header you're looking at +$500.00. Not worth it in my opinion, save 4 times that amount and swap it with an H series.

[91cbseven]

That makes sense, the h22 and f22 block are the same right? Just wondering what a basic swap involves because someone told me that the block is the same but everything up has to change.

[Jarrett]

No, they are not the same. There is plenty of information on this forum about their differences. Check out the swap section of this site.