C63 AMG (W204) 2008 - 2015
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HMS/Widebody and Unibody

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Old Oct 4, 2019 | 08:29 AM
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HMS/Widebody and Unibody

Hello guys,

Maybe a dumb question but only way to find out is to ask. So everyone knows when you extend with the fender flares or do a wide body there is cutting of the rear oem quarter panels so that the wheels will have no internal block after the flares are installed. But this means cutting into the Unibody of the car, and isn't that a bad thing? Doesn't this affect the structural rigidity of the car?
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Old Oct 4, 2019 | 08:51 AM
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I think your assumption is correct. I spent some time as a volunteer firefighter and we received tons of training on extricating people from cars (using cutting tools, cribbing, airbags, jaws of life, etc). The instructor told us that when unibodies replaced vehicle 'frames' the unibodies became the frame. Once the unibody is compromised, car is considered 'totaled'.
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Old Oct 4, 2019 | 09:08 AM
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I'm not very familiar with the installation process, but I thought that you are supposed to replace the cut portion with additional sheet metal welded in place.
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Old Oct 4, 2019 | 09:12 AM
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Here it is. Check about 2:30 minutes in.
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Old Oct 4, 2019 | 09:23 AM
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That sounds correct to me. I'd be surprised if you have to cut into the unibody. The unibody is typically the floor, the A, B (sedan), and C posts and the roof. The entire quarter panel area has no unibody unless you cut into the floor or C post.
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Old Oct 4, 2019 | 09:28 AM
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I thought it would be like this image shows?

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Old Oct 4, 2019 | 09:47 AM
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Also that video doesn't seem typical - they literally cut the outer shell. Seems like wayyy to much cutting/welding...
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Old Oct 4, 2019 | 09:49 AM
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Old Oct 4, 2019 | 09:55 AM
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Danke Jasonoff - so at 1:53, he is spot welding it back shut (as predicted) so that the plates keep together
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Old Oct 4, 2019 | 10:14 AM
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^^ that one. Just cutting into the skin.
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Old Oct 4, 2019 | 10:28 AM
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Originally Posted by Adi-Benz
Danke Jasonoff - so at 1:53, he is spot welding it back shut (as predicted) so that the plates keep together
It's just a double wall panel. Could probably get away with rivets if you you don't have access to a spot welder.
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Old Oct 4, 2019 | 10:28 AM
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Cool. In that case I can carry on my plan when I end up finding the right vehicle (alas the search continues!) Expected product alike:

HMS/Widebody and Unibody-dmxztja.jpg
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Old Oct 4, 2019 | 10:37 AM
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Originally Posted by Adi-Benz
Cool. In that case I can carry on my plan when I end up finding the right vehicle (alas the search continues!) Expected product alike:

So that’s why you had an sl550 VIN you needed searched 😁
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Old Oct 4, 2019 | 12:17 PM
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LOL you got me 😂 almost bought it
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Old Oct 4, 2019 | 12:18 PM
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Originally Posted by Adi-Benz
LOL you got me 😂 almost bought it
Why didn’t you? Do you have a c63?
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Old Oct 4, 2019 | 12:49 PM
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Originally Posted by Jasonoff
Thanks for posting!

As long as the 2 sheets of steel are welded back together and sealed there are no issues. This is how the factory does it as well in other parts of the chassis.
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Old Oct 4, 2019 | 12:56 PM
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Edit Nah nobody cares

Last edited by Adi-Benz; Oct 4, 2019 at 09:02 PM.
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