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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 10-22-2012, 09:53 PM
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UNBROKEN UNBROKEN is offline
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Default Let's discuss Y pipes done right and wrong....an FYI thread.

Reading through Grub's Magnaflow review thread got me to thinking about some of the Magnaflow Y pipe replacement jobs I've seen done on here.
Yes, the factory Y is crimped pretty bad as well as the pipe under the trans and there is some small benefit to replacing them. However...if you're having your local muffler shop just bend up pipe and not using mandrel bends you really aren't gaining anything. As I stated in his thread...you're just moving the old problem to a new spot.
This thread isn't meant to make anyone mad, or talk down to whoever's pics I used as examples here....it's to hopefully get people to think about the big picture and how to do things the right way instead of the cheap, easy way.
Mandrel bends cost a few bucks...but they're the only way to truly do the job correctly. When you order your MagnaflowY's you can also order the bends to have your local shop fit up the pipe correctly and weld it all up for ya. The job can be done with the Y, 2 45* bends and 2 90* bends....all 4" radius.

If you look at these pics...you can see the muffler shop crimp bends....no better than the OEM stuff.




This one was done using separate mandrel bends and fit to the OEM exhaust.


If you want the most out of your exhaust....spend the extra coin and have it done properly.

Last edited by UNBROKEN; 10-22-2012 at 10:11 PM.
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  #2  
Old 10-22-2012, 10:14 PM
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Quote:
you can see the muffler shop crimp bends....no better than the OEM stuff.
Actually on my truck all the oem bends are mandrel, so in this case the oem has become very good and the exhaust shop is WORSE than oem(except for manifolds, y pipe, and muffler).

Would you agree?

This is why I spent the few extra bucks for mandrel bends for when I do mine. Glad I did, I'm sure it will make a difference.
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Old 10-22-2012, 10:28 PM
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Guess I shouldda said no better than the OEM Y....the rest of it really isn't bad. Even the flattened part under the trans pan is acceptable in a pinch.
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Old 10-22-2012, 10:33 PM
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Just curious, how much welding experience do you have? I'm very impressed with that y pipe job you did. I have next to no welding experience other than screwing around a little bit and that's what's keeping me from tackling my exhaust. I'm afraid of getting into it and having issues then not having the truck done by the end of the weekend...
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Old 10-22-2012, 10:40 PM
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A lot actually...been certified for over 25 years. The welds I did on that mid pipe weren't done to look good....I was just trying to get done. I wouldda used the TIG if I wanted it to look good. I doubt anyone will ever be under my truck looking though so I rushed it. lol
I shouldda at least worn my reading glasses...I can't see shit up close as you can tell by my inability to weld in a straight line without them. lol
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Old 10-22-2012, 10:44 PM
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Wow, now you're really making me doubt my abilities haha. I have a lincoln MIG it's pretty easy IMO, I've probably welded for about a total time of 30 minutes and I feel like I am decent at it all things considered, but I then cut a few short pieces of exhaust tube to practice and wow was that harder than welding flat stock lol.

Sorry if I'm getting the thread off topic....although it is sort of on topic haha.

I figure exhaust work is good practice, as it can look horrible and not matter. And I suppose worst case scenario I could tack it and take it to a welder...
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Old 10-22-2012, 11:02 PM
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I need to crawl under mine and see how they put mine in. How do they do mandrel bent pipe compared to the other? If they just moved the problem that would be irritating.

Anyone know of a good exhaust shop that does mandrel bent piping around DFW? I'm looking to get a set of 5 inch tips installed, the pipe under the trans replaced, and my Y pipe redone if it needs be.
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Old 10-22-2012, 11:13 PM
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It's hard to find an exhaust shop that has a mandrel bender. Most likely will have to buy the bends and have them welded in. They are pricey but worth it.

Closest shop with a mandrel bender to me(Orlando) that I know of is in Miami, and $$$$
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Old 10-22-2012, 11:14 PM
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Few if any local shops will have a mandrel bender. It's a 6 figure machine to buy. Your best bet generally is to buy mandrel bends from Summit, Jegs, etc and fab up your own stuff.
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Old 10-22-2012, 11:15 PM
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Damn. I had no idea it was that serious lol.
http://m.summitracing.com/parts/wlk-41437

Something like this?

Last edited by GhostR1der; 10-22-2012 at 11:19 PM.
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