Homemade 2into1 header
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Road Warrior
Joined: Aug 2010
Posts: 1,788
Likes: 5
From: Tennessee
Homemade 2into1 header
I have an 06 ultra classic 88ci with 203 cams big sucker etc. I am trying to squeeze every ounce of performance out without going internal. Has anyone out there ever modified a stock rear y pipe into a true 2 into 1 with dummy left side pipe. i'm gonna try it and wanted any input i could get.
Ultimate HDF Member
Joined: Aug 2008
Posts: 5,413
Likes: 17
From: eastern oklahoma
that's been done a lot. it'll improve scavenging. you can use a freeze plug at the "Y" to accomplish that modification. be sure to use a steel freeze plug rather than the brass. it's one of the few cheap modifications that can be done.
Tourer
Joined: Apr 2010
Posts: 316
Likes: 0
From: Tulsa OK
Funny, I was thinking about doing this to mine also. Just put a plug on the output side of the cross over pipe....Is that what you are thinking? Then all exhaust will run straight thru the right pipe and out? That was what I was kinda thinking about.
Will you be welding it, or bolting it, or clamping it or ?????
What about sealing it up tight???? I'd like to be able to remove it if I wanted and go back to dual if it didn't work out....
Will you be welding it, or bolting it, or clamping it or ?????
What about sealing it up tight???? I'd like to be able to remove it if I wanted and go back to dual if it didn't work out....
Ultimate HDF Member
Joined: Aug 2008
Posts: 5,413
Likes: 17
From: eastern oklahoma
there are a few ways to attach the plug to where you'd be totally sealed. a clamp would work, and the plug could also be welded into the pipe's end. i'd remove the exhaust pipe if you're planning on welding it with either a mig or welding torch. reason being the current could goof with your ecm or other electronics if you don't have it unplugged and there are some delicate sensors in the electrical system that could be fried. if you welded it in via oxy acetylene, you'd be pretty close to the gas tank and you know where that could lead. our harleys use a clamp for the slip on mufflers, that might be the simplest way to do it. they'd clamp that freeze plug in place if that's your plan. the 2 into 1 modification has been done a ton of times, it shouldn't be tough at all. you could lose 15 pounds of ugly fat off of the left side of the bike too. if i'm right, the rear 02 sensor is on the live side of the "Y" but check to make sure. i don't think your 06 uses 02 sensors but i could be wrong.
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Road Warrior
Joined: Aug 2010
Posts: 1,788
Likes: 5
From: Tennessee
there are a few ways to attach the plug to where you'd be totally sealed. a clamp would work, and the plug could also be welded into the pipe's end. i'd remove the exhaust pipe if you're planning on welding it with either a mig or welding torch. reason being the current could goof with your ecm or other electronics if you don't have it unplugged and there are some delicate sensors in the electrical system that could be fried. if you welded it in via oxy acetylene, you'd be pretty close to the gas tank and you know where that could lead. our harleys use a clamp for the slip on mufflers, that might be the simplest way to do it. they'd clamp that freeze plug in place if that's your plan. the 2 into 1 modification has been done a ton of times, it shouldn't be tough at all. you could lose 15 pounds of ugly fat off of the left side of the bike too. if i'm right, the rear 02 sensor is on the live side of the "Y" but check to make sure. i don't think your 06 uses 02 sensors but i could be wrong.
Thread Starter
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Road Warrior
Joined: Aug 2010
Posts: 1,788
Likes: 5
From: Tennessee
Funny, I was thinking about doing this to mine also. Just put a plug on the output side of the cross over pipe....Is that what you are thinking? Then all exhaust will run straight thru the right pipe and out? That was what I was kinda thinking about.
Will you be welding it, or bolting it, or clamping it or ?????
What about sealing it up tight???? I'd like to be able to remove it if I wanted and go back to dual if it didn't work out....
Will you be welding it, or bolting it, or clamping it or ?????
What about sealing it up tight???? I'd like to be able to remove it if I wanted and go back to dual if it didn't work out....
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Stellar HDF Member
Joined: Dec 2009
Posts: 2,561
Likes: 280
From: North Cental Iowa
Your gains will be very marginal, a true 2 into1 has pipes that are closer in length to each other & a true collector to promote the scavenging. I'm wondering why you would have lost power after installing the Fulsac kit, I'm not familiar with this kit what does it do?
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Thread Starter
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Road Warrior
Joined: Aug 2010
Posts: 1,788
Likes: 5
From: Tennessee
Your gains will be very marginal, a true 2 into1 has pipes that are closer in length to each other & a true collector to promote the scavenging. I'm wondering why you would have lost power after installing the Fulsac kit, I'm not familiar with this kit what does it do?
This can be done easily, but it will sound like crap. It won't sound or perform anything like a proper 2-1 collector. You'd be better off modifying the y pipe to eliminate the restriction at the union closest to the exhaust flange.
Last edited by Mike; Jan 2, 2011 at 05:18 PM.