DIY Y pipe bellows - Ford Powerstroke Diesel Forum
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Old 05-04-2013, 06:02 PM
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DIY Y pipe bellows

I'm getting ready to upgrade to a MTW hybrid, 175/75s and a regulated return. While I'm in there I want to upgrade to SS exhaust bellows, has anyone cut their Y pipe apart and welded in bellows themselves? I am wondering if you need a jig to do this or can you weld in the bellows just using measurements?
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Old 05-04-2013, 06:57 PM
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The two sets that I did, I did with markings/measurements, but I wouldn't recommend doing this without a jig. I think without a jig or mock-up motor, you'll just end up wasting your time and the V-band flange won't line up.
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Old 05-04-2013, 07:19 PM
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I done mine cab on. Cut out the old ones, then bolted the pipes and flanges down then made small cuts for a butt joint connection for the bellows. Then tacked them in, removed y pipe assembly and tig welded it together. Took about 8 hours with all the trimming, but worked out great.
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Old 05-04-2013, 08:00 PM
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Quote:
Originally Posted by windrunner408 View Post
The two sets that I did, I did with markings/measurements, but I wouldn't recommend doing this without a jig. I think without a jig or mock-up motor, you'll just end up wasting your time and the V-band flange won't line up.
How did they turn out, any problems with the flange not lining up with the turbo?

Quote:
Originally Posted by kdogg85 View Post
I done mine cab on. Cut out the old ones, then bolted the pipes and flanges down then made small cuts for a butt joint connection for the bellows. Then tacked them in, removed y pipe assembly and tig welded it together. Took about 8 hours with all the trimming, but worked out great.
I may try a combination of both methods, pull the Y pipe measure everything up, cut the old bellows out, slip the new ones on and bolt back up with the new bellows in place then tack them pull the Y pipe again and finish welding.

Last edited by snafu!; 05-05-2013 at 10:53 AM.
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Old 05-05-2013, 07:06 AM
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I would be more inclined to make a jig. Tack both ends of the pipe to a fixture and cut the flex out.

I've thought about doing this but it seems like a pain, if it happened to my truck I'd just buy a new pipe
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Old 05-05-2013, 07:13 AM
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where can one buy the bellows??
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Old 05-05-2013, 09:22 AM
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I got them from summit. My wife's truck has them as well, haven't let go yet.
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Old 05-05-2013, 11:10 AM
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I would send the Y pipe to unlimited strokers but the shipping from Alaska and back would be more than what they charge and I would also like to do the mad mod while it is out.

Does anyone know what grade stainless the Y pipe is, I only have a mig.
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Old 05-05-2013, 11:21 AM
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The OEM y-pipe is 409 stainless steel.
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Old 05-05-2013, 04:42 PM
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Thanks, I'll have to pick up some 309 wire.
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