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Old 07-16-2013, 05:51 AM   #1
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Undercarriage bracing removal

I have a 2013 ZL1. I have installed the Corsa exhaust at a local shop. Although specifically asked "coupe or convertible ?" They claim the stock undercarriage bracing bars at the rear will not fit now. There is another pair that do fit.on the rear ones there is a 3 point connection that runs diagonally and has connection points at the edge of the frame behind the doors then connecting at the base of the rear shock and then close to the centre under the trunk. The last section of pipe sits too low to allow the connection of the last bolt. The shop has spoken to several sources and say that the rear braces are overkill and either not required or the last section can be snipped off and the 2 remaining at the front will suffice. Any input on this would be appreciated.
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Old 07-16-2013, 09:57 AM   #2
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Don't do it.
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Old 07-16-2013, 10:06 AM   #3
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I'm guessing that especially with the torque and power of a ZL1 that these frame connectors are very important..even more so with a convertible.
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Old 07-16-2013, 10:24 AM   #4
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Quote:
Originally Posted by Doogie View Post
I have a 2013 ZL1. I have installed the Corsa exhaust at a local shop. Although specifically asked "coupe or convertible ?" They claim the stock undercarriage bracing bars at the rear will not fit now. There is another pair that do fit.on the rear ones there is a 3 point connection that runs diagonally and has connection points at the edge of the frame behind the doors then connecting at the base of the rear shock and then close to the centre under the trunk. The last section of pipe sits too low to allow the connection of the last bolt. The shop has spoken to several sources and say that the rear braces are overkill and either not required or the last section can be snipped off and the 2 remaining at the front will suffice. Any input on this would be appreciated.
Don't even think about compromising any of the factory braces.
GM put them there for a reason.
Especially on a ZL1.
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Old 07-16-2013, 11:14 AM   #5
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I agree with the others, don't do it. I would trust the GM engineers over a local shop guy.

If you are going to modify something, modify the aftermarket exhaust instead of your body structure.
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Old 07-16-2013, 01:21 PM   #6
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Don't do it.

ESPECIALLY on a vert. But personally, I would not eliminate bracing even on a coupe.
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Old 07-16-2013, 02:30 PM   #7
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I did it. However, I put something in place of it which allowed me to reuse the tunnel braces. If you don't have them in, you will feel the loss of rigidity in the car, so it will be important that you do put something in place. For myself, I went with the LG chassis brace. The only thing that has been taken out completely is the two diagonal in the rear that from the center of the car, up, and out to the side rails. Even with those gone and the chassis brace in, everything feels very tight and strong, and this is with all the power I have now.
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Old 07-17-2013, 09:02 PM   #8
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No way, no how. Are you kidding me? If the exhaust can't get around it, get rid of it and over it. You have many more choices. You want as much rigidity as you can get.
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Old 07-17-2013, 10:55 PM   #9
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The chassis braces use the existing mounting points and add a few more. It also allows to drop the tunnel braces down enough to clear the 3" piping. The car feels just as strong as it did stock if not stronger because of the upgraded sway bars.
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Old 07-18-2013, 07:09 AM   #10
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Yeah, don't do it... It really sounds like the shop didn't install your exhaust correctly.
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Old 07-18-2013, 08:13 AM   #11
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I am running the Corsa exhaust on my ss convertible with no problems. It clears all the braces. Don't no if the braces are the same on both cars.
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Old 07-18-2013, 09:35 AM   #12
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Some of the aftermarket bracing is very effective, if not better than, the stock braces. Some specifically allow for 3" exhaust. But none of it should be removed without something else stiffening the chassis. Not sure where you're having the exhaust work done, but I would recommend taking it to a reputable suspension shop for their input before cutting any braces.
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Old 07-18-2013, 08:10 PM   #13
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Quote:
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I am running the Corsa exhaust on my ss convertible with no problems. It clears all the braces. Don't no if the braces are the same on both cars.
Me too

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Old 07-19-2013, 05:34 AM   #14
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Wondering why the ZL1 owner switched from the NPP GM dual mode to the corsa? I am having issues with my NPP GM mufflers (weird resonance at 3000 rpm and wire stuffing coming out of them). Let me know.

The Corsa set up for the ZL1 is 3 inch pipe. That's why they specifically state it will NOT fit the convertibles (because of the bracing). The Corsa set up for the SS is 2.5 inches, so it will fit the convertibles with no modifications. However, the SS corsa 2.5 inch version is not Quad tip, like the GM NPP dual mode.

Good news is that you can buy spacers for the rear cross braces (where they meet the trunk), and a new front brace to accomodate the 3 inch pipe. Check out Phastek Performance's website and then the bracing kit for the "Stainless works" 3 inch system.
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Old 07-21-2013, 07:19 PM   #15
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You guys running corsa exhausts - are they the 3" ZL1 exhausts? I've been looking to modify my '12 ss vert by adding quad tip exhaust + 1LE diffuser. It seems as though the ZL1 is the only option.
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Old 07-21-2013, 09:24 PM   #16
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Quote:
Originally Posted by Subzero View Post
You guys running corsa exhausts - are they the 3" ZL1 exhausts? I've been looking to modify my '12 ss vert by adding quad tip exhaust + 1LE diffuser. It seems as though the ZL1 is the only option.
You can also buy dual tips and have them welded on, this is what I am doing to my s-type exhaust. LMR is gonna fabricate some j-pipes for me and put the quad tips on.
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Old 07-21-2013, 09:32 PM   #17
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I would say without the rear braces over time the body is going to flex too much and you may get sagging or worse cracking of the unibody. I would be very wary if removing any of the factory bracing.
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Old 07-21-2013, 10:03 PM   #18
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Oh I don't want to remove it, I was looking at something like this to compensate. I'm just curious if this is the only brace in the way of 3" exhaust.
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Old 07-21-2013, 10:08 PM   #19
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Quote:
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Oh I don't want to remove it, I was looking at something like this to compensate. I'm just curious if this is the only brace in the way of 3" exhaust.
That would probably be good
But I think you may also need the tunnel brace.
http://www.camaro5.com/forums/showthread.php?t=298145
I'm not sure if that is also for the convertible though.
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Last edited by Angrybird 12; 07-21-2013 at 10:30 PM.
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Old 07-21-2013, 10:33 PM   #20
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Just a suggestion, but what you're looking at is a polished rear tunnel brace, which if you don't mind what the factory one looks like, you can just as easily go to the hardware store, buy some 1/2" thick washers and longer bolts and it's the same thing. When I was talking about removing the rear braces, I was referring to the two brace bars that got from the center of the rear and go out to the sides. Those are notched into place and will not clear a 3" axle-back unless you remove them. At least nothing that I know of.
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Old 07-25-2013, 02:59 AM   #21
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I notice you have 3" exhaust. How did you clear those rear "v" braces in the back?
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Old 07-25-2013, 05:11 AM   #22
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I took them out and replaced them with an aftermarket undercarriage brace, so the "V" braces is completely gone. And honestly, there is no difference when it comes to handling.


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Last edited by Chris82xx; 07-25-2013 at 02:45 PM.
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Old 07-26-2013, 12:06 AM   #23
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Oh really? Did you have a link to such a brace? I'm going to be the guinea pig and order the 3" Corsa ZL1 exhaust for my vert. Originally, I was planning on welding up new rear braces and spacing the middle ones, but since you have that brace, I might not need to retrofit anything.
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