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Old 06-14-2021, 09:01 PM   #1
HiSPL
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Default Anyone built their own NA downpipe?

Would like to see pics or hear about what you done did.

I want to upsize the entire exhaust but will be keeping the stock manifold.
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Old 06-15-2021, 01:00 AM   #2
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Originally Posted by HiSPL View Post
Would like to see pics or hear about what you done did.

I want to upsize the entire exhaust but will be keeping the stock manifold.
mikep is building one for an L28 or 26 or whatever it is. Oooooooobviously not the same cylinder count, pipe routing and all that but it's a sight to behold, plus it might give you ideas
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Old 06-15-2021, 08:11 AM   #3
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I just increased the size of the j-pipe with the original flange ported for the new tubes, to a 2.5 inch turbo exhaust. It worked out pretty good, 135whp with a k-cam on a untouched 530 head
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Old 06-15-2021, 12:30 PM   #4
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Yes, i built a Y-pipe to B30E and it killed low end torque. After several simulations I will try smaller and longer tube, have merge collector and megaphone to adapt collector to exhaust pipe.
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Old 06-26-2021, 11:36 AM   #5
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Why not replace the stock manifold at the same time?

Get a cheapo pair of SBC headers and cut them up. Way back when I did a 4-2-1 and then converted it back to a 4-1, ugly but it worked and still lives on to this day.



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Old 07-06-2021, 06:22 PM   #6
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Get a cheapo pair of SBC headers and cut them up.
What did you use for the manifold flange to mate them to the redblock head?
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Old 07-06-2021, 06:30 PM   #7
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For me, it's just not needed. I'm staying NA and the stock manifold flows good enough. It's the rest of the exhaust that is restrictive.
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Old 07-06-2021, 07:49 PM   #8
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What did you use for the manifold flange to mate them to the redblock head?
I think Yoshifab cuts a manifold flange, you can buy it from his website
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Old 07-07-2021, 05:26 AM   #9
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Originally Posted by thelostartof View Post
Why not replace the stock manifold at the same time?

Get a cheapo pair of SBC headers and cut them up. Way back when I did a 4-2-1 and then converted it back to a 4-1, ugly but it worked and still lives on to this day.
That reminds me of a Teutonics manifold I had in a Jetta many moons ago
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Old 07-08-2021, 08:36 AM   #10
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Originally Posted by thelostartof View Post
Why not replace the stock manifold at the same time?

Get a cheapo pair of SBC headers and cut them up. Way back when I did a 4-2-1 and then converted it back to a 4-1, ugly but it worked and still lives on to this day.
Do you by chance mean SBF? The SBCs unevenly spaced exhaust ports would make for a ton of hacking.
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Old 07-08-2021, 03:38 PM   #11
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Do you by chance mean SBF? The SBCs unevenly spaced exhaust ports would make for a ton of hacking.
Either that or its for a LS/LQ, I unfortunately don't remember. I used to have the other half of these headers as I was going to do the same modification but for my Nissan. Though I think I threw it away because I can't find it and I don't want to look very hard.
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Old 07-10-2021, 04:27 PM   #12
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Originally Posted by woodenpudden View Post
mikep is building one for an L28 or 26 or whatever it is. Oooooooobviously not the same cylinder count, pipe routing and all that but it's a sight to behold, plus it might give you ideas






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Old 07-14-2021, 01:35 AM   #13
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Was another thread on here for a cheapo one from a sbf or the 2.3l ford also.
Ls passenger side might be pretty close also.
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Old 07-24-2021, 07:31 PM   #14
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Originally Posted by HiSPL View Post
For me, it's just not needed. I'm staying NA and the stock manifold flows good enough. It's the rest of the exhaust that is restrictive.
Agreed! We have over 150whp in our B230 based racecar and it's still using the factory exhaust manifold with a little bit of port work. The factory downpipe isn't horrible, either. Depending on what you want to do, you may want to shorten it or leave it full length, but you ABSOLUTELY want to make the 2-1 merge exit into a larger diameter exhaust than stock. At least 2 1/4" or even 2 1/2".

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https://pbase.com/mperry/image/171783471.jpg
Nice! Right now we are looking into building a new downpipe for our setup that isn't basically stock sized with our almost double factory HP goals for the race car and want to go up to 1 7/8" or 2" diameter piping. The 1 7/8" pipe will work better with reusing the original downpipe's flange and should be enough for 200whp with the right supporting mods, Erland Cox suggests, so we'll stick with that for ease of building. We're still trying to find a place to make us the 2-1 merge, though. I couldn't find one online that was reasonably priced. We may have a local fabricator that'll do it, but I like what you're doing here anyway.

EDIT: Thanks for the www.coneeng.com link whoever posted that somewhere that apparently wasn't this thread!

Last edited by klr142; 07-30-2021 at 03:27 AM..
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