Megan Racing 4-2-1 Stainless F22 F23 Header , Modification / Install

[A20A1]

The -15 degree tilt to the A-PIPE / SECONDARIES will be fairly easy to accomplish.
after that there will be no problem on actual pipe fitment... all the other work will have to be to the ports on the primaries flange and the spacing of the pipes up there. there is no issue with crossmember hitting ... and with a gasket it should be even further away from the front of the block and oil pan.

so did it work?

Well not yet, it wont run till I get another accord... but I dont need the full accord body anymore. It works in my book, all the unknowns are filled in. All that remains is for me to work on the spacing using my spare head and block to build off of.
Thank you MEGAN RACING... even though they could probably easily make one for the A20 without me needing to modify one.

[A20A1]

Anyone else want to try this mod, here is the link for the A20 Flange thread.
https://www.3geez.com/forum/showthread.php?t=47396

A very rough measure 12.25" secondary 16.50" primary which makes it 28.75" and then another 13.50" till the last flange.

[A20A1]

Here is the progress of the A-PIPE / SECONDARY PIPE -15 Degree Tilt.



When I finish this the secondaries will fit under the car and under the pan no problem.

[A20A1]

Hose Clamp As Hack Saw Blade Guide at 15* angle.


15 Degree Metal Section Removed.


Secondaries bent to fill gap.


Before and After Pipe Rewelded

It Fits...

sort of, the height of the deck or possibly the head is taller then the A20's height so these headers sit lower and may not be lowered 3G friendly.

[mkymonkey]

so when are you going to start making these for us and selling them? you know thats what you have to do since you showed us now. either that or post up a very detailed how to on it

[A20A1]

How much more detail do you want me to add?

I'm spilling trade secrets here you guys!

[speedpenguin]

Man, that looks awesome! Good job.

[MessyHonda]

so im guessing thoes are better than the pacesetters?...can we trade...il put some cash on top of that...or better yet u can buy the headers and then il send u the cash once u finish moding them...lol good job bro

[A20A1]

Yes this header is much much better then Pacesetter however it does not come with EGR hookup.

I got this header for $30 because of a defective flex pipe.
Upon inspection I saw damage from being installed on a lowered car and also a small hole in one of the welds. And one more thing, the O2 sensor plug seems stripped. Or the O2 sensor port is striped. Either way, this is just a test header to see how much work is involved in getting one to fit, it will function perfectly though when I'm through fixing it up.

I intent to replace that section of leaky flex pipe with 2" straight pipe... the last pipe by the way is 2" so that will be perfect for insterting into a cat or larger diameter pipe.

Next up is the outer cylinders #4 and #1... these will be the only ones I cut to bring closer...
I need to close a 0.625" gap, 4" above the secondary flange. That should give me about 1" (0.50" on each side) less of a gap up by the head flange.
cross your fingers boys and girls

so im guessing thoes are better than the pacesetters?...can we trade...il put some cash on top of that...or better yet u can buy the headers and then il send u the cash once u finish moding them...lol good job bro

If I'm sure this header will fit with minimal issues on the accord once modified, I'd still need you to buy the header and pay for the mods before I can do the work... I have no extra cash to build another one and then sell it. I'd say you'd spend no more then $250. Assuming I can get the A20 flange for cheap in stainless.

[A20A1]

BMC Racing A Series Flange on order... who knows what will happen next

[speedpenguin]

Hopefully something fun!

[A20A1]

Nevermind, looks like the order is on hold till I can transfer the money out of my bank and into paypal.

[ilikevtecs]

sorry to ruin the thread i want to say awsome work keep up the good work and thank god 4 people like u that make stuff happen

like getting my money back! just reminding you!

[A20A1]

Keep it in the PM's please

[hotdoghogie]

hmmm crazy... why all the work though?

[A20A1]

Basicly I scored a cheap F-Series header and now have it almost ready to bolt to the A20. It's not a simple bolt on though, port size and spacing and shape are different as well as the angle the A-Pipe sits at.

I liked that the Megan primaries were a bit longer then DC or PS.

Hopefully the how-to opens more doors to aftermarket then simply PaceSetter or DC. There are also Greddy and Mugen headers for the F-Series as well as Megan, they just need a little reworking to fit, but it's really not that hard if you have the right tools on hand... which I don't but I'm in no rush.

[MessyHonda]

nice to see some progress.

[SQ is the SQUAD]

not to thread jack or anything but the other day while i was setting up my tools on my new garage i came accross my old honda 954 header. well i got a wild idea of modding this to my a20a flange. since the 954 dosent have a soild one piece frame it wil be pretty easy to space the runners. just not sure if the piping was big enough. gotta get a ruler and measure it

[A20A1]

Sounds interesting.

I ordered my flange

$46.00 from BMC Racing

... I can't wait to get it, just wish I had a 3G to run the bugger when I'm finished.

[SQ is the SQUAD]

took a few quick pics of the 954 headers. i can get them to work, it'll take a lil modification but its a good start

[A20A1]

ahaha, looks just as convoluted as my first header I made


Definately a good start though. How long are the pipes?

And whats that extra port for?


Use a spare head and weld the pipes while the flange is bolted to the head to keep the flange from warping.

[mkymonkey]

im guessing since its a motorcycle header....its to split the exhaust to two mufflers

[SQ is the SQUAD]

the extra port has some things in it that was hooked up to the throttle, i guess to keep backpressure or something. anyways i was conna cut that section off, cut off the cone at the end of the pipe and leave the 2.5" opening. so it will basically be a 4-2-1

[A20A1]

took a few quick pics of the 954 headers. i can get them to work, it'll take a lil modification but its a good start

Wow what an interesting peice of engineering... it changes the merge to help low end... I'm sure taking it off all together though will help top end.
http://www.motorcycle.com/mo/mchonda/00929.html#03

It actually changes between Sequential Pairing 180* 1 & 2 . 3 & 4 , and Non-Sequential 360* 1 & 4 . 2 & 3

Sequential and Non-Sequential is a term I see used by SMSP when refering to their headers.

180 VS 360


Problem is I see people saying that the valve increases backpressure and that is what helps the low end... they think it's just a restrictor but actually it's switching between 180 and 360 so backpressure should be the same.



found a nicer full picture, I guess depending how you have to install it will determine which pairing you will get to use.

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[SQ is the SQUAD]

mike, your a research monster