DIY Merge Collector / Y-pipe Advice? - Grassroots Motorsports

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Giant Purple Snorklewacker MegaDork 4/11/14 12:12 p.m.

I need to make a 2 into 1 Y pipe for my exhaust.

My basic plan was to section two straight 2.5" pieces at a 60 degree angle and tig them together in a V, then take another piece of 3" and stretch the end to fit over them, weld.

Seems simple enough but - I've never done it. Is there a better way?

turboswede GRM+ Memberand UltimaDork 4/11/14 12:16 p.m.

How about this:

http://www.summitracing.com/parts/vpe-10356/overview/

$89 and you're done.

Or you can get just the merge collector:

http://www.summitracing.com/parts/dou-h7665/overview/

$14.50

Giant Purple Snorklewacker MegaDork 4/11/14 12:32 p.m.

Hmmm. It's pretty hard to argue with that $14.50 piece as a head start.

turboswede GRM+ Memberand UltimaDork 4/11/14 12:33 p.m.

In reply to Giant Purple Snorklewacker:

Yarp.

They have other sizes as well, depending on your needs.

novaderrik PowerDork 4/12/14 1:14 a.m.

sometimes it's more fun to make something yourself. then you can point at it and say "i made that" when talking to your "car guy" friends that think that putting a cone air cleaner on a late model Civic is something worthy of praise and adulation..

fasted58 PowerDork 4/12/14 1:37 a.m.

Fournier's Fabricating Handbook has a section on that IIRC. Fab a couple tools to aid in the forming. Completely DIYable.

Driven5 GRM+ Memberand Reader 4/12/14 1:41 a.m.

Another good source for pre-fab "kits" is Cone Engineering.

Here's a good template for the DIY method: Merge Collector Fabrication 101

GregW1 New Reader 4/12/14 8:06 a.m.

I took two 45 deg. elbows and sliced them along their length so the cut ends formed a circle that fit the downstream pipe. That pipe was sized to provide the combined area of the upstream pipes. After tacking everything together and checking the fit I welded everything up with a small tip on an acetylene torch. Great fun if you don't mind some spatter burns. Remember the welded piece is HOT. Don't pick it up without gloves.

jimbbski HalfDork 4/12/14 9:27 a.m.

GregW1 wrote: I took two 45 deg. elbows and sliced them along their length so the cut ends formed a circle that fit the downstream pipe. That pipe was sized to provide the combined area of the upstream pipes. After tacking everything together and checking the fit I welded everything up with a small tip on an acetylene torch. Great fun if you don't mind some spatter burns. Remember the welded piece is HOT. Don't pick it up without gloves.

How did you figure that out?

sevenracer Reader 3/13/21 7:19 a.m.

Just a quick note to say - as usual - this forum delivers.

Was having trouble finding a merge collector to fit a particular flange - no luck at the big shops - Summit, Jegs, Speedway, Amazon, etc.

Googling got me to this thread, and after a call to Cone Engineering, I've got parts on the way. Actually wound up speaking with the owner, he answered all my questions and gave me some tips about how to fab what I needed. They also have a number of video's regarding exhaust fabrication on their site. Great experience overall.

Appleseed MegaDork 3/13/21 7:31 a.m.

I'm hoping Wheels777 chimes in.

wspohn SuperDork 3/13/21 11:55 a.m.

novaderrik said:
sometimes it's more fun to make something yourself. then you can point at it and say "i made that" when talking to your "car guy" friends

But when it turns out to leak like a sieve, it is nicer to be able to say "Darn that manufacturer - I should have made it myself and it wouldn't have leaked" than only being able to say 'Oops'.

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