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Discussion Starter #1 (Edited)
Before you forum nazis murder me for asking this question.....I have searched and got conflicting answers. I'm just reviving an old problem and want current possible solutions since it's been almost 10 years since these cars we produced.

I have the xforce 1 7/8 Headers w/ full 3" fatback exhaust. The exhaust came with a tunnel brace (see attached pic. it has bends that makes it lower to clear the exhaust) that supposedly accommodates the exhaust. But the exhaust is till rattling on it. I've tried adjusting the exhaust several times. Still rattling. My car is lowered a good amount so I cant use spacers (which I think doesnt help the brace, makes it inadequate) the existing brace does hang lower than stock and hits all speed bumps.


My question is....who removed their tunnel brace? And what is the outcome over time? (Those who haven't removed their tunnel brace at anytime and driven that way please do not reply) I'm not looking for opinions just actual experience with the situation. Thank you.
 

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When I bought my IOM GT, the previous owner had removed the tunnel brace to accomodate a custom exhaust setup. I ended up changing out that system for another and put a brace back on. I didn't notice any difference, never had any problems with it off and didn't actually know it wasn't originally on the car till I put it up on a lift to replace the exhaust. That's my experience, hope it helps.
 

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That is what washers are for. Stack 2 or 3 under the brace at each bolt and you will have your clearance . Or loosen every clamp on the exhaust. Then place a 1/2" or 3/4"
piece of wood between the X-pipe and the brace. Tighten everything back up. remove the wood and you should have the clearance you need. Either way, the brace is there for a reason.
 

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3" exhaust hitting tunnel brace....

I really want a Halo tunnel brace. But to the Op I have run without my brace a few years now with no ill effects, now in an actual side collision id feel safer with it there.


Sent from my iPhone using Tapatalk
 

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Discussion Starter #7
That is what washers are for. Stack 2 or 3 under the brace at each bolt and you will have your clearance . Or loosen every clamp on the exhaust. Then place a 1/2" or 3/4"
piece of wood between the X-pipe and the brace. Tighten everything back up. remove the wood and you should have the clearance you need. Either way, the brace is there for a reason.
Ummm no. My car is lowered by almost 2". Adding spacers will make the tunnel brace push towards the ground reducing ground clearance. I'm taking th bitch off until I can fab a custom one. Lol.
 

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Discussion Starter #8
I'm sure you are right. Makes sense. But the way I look at it, if I get hit from the side....the car will be totalled anyways being how soft the platform is. Most cars dont have this brace, my 4th gen Camaro didnt have this brace, so I think it will fine for now. Lol. As long as it the car is rigid enough for daily driving purposes....its coming off until I can Fab something in place. Thanks for the info though.
 

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I really want a Halo tunnel brace. But to the Op I have run without my brace a few years now with no ill effects, now in an actual side collision id feel safer with it there.


Sent from my iPhone using Tapatalk
I've got the Halo brace. It's a great piece, well worth the money.
 

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Discussion Starter #10
I really want a Halo tunnel brace. But to the Op I have run without my brace a few years now with no ill effects, now in an actual side collision id feel safer with it there.


Sent from my iPhone using Tapatalk
I've got the Halo brace. It's a great piece, well worth the money.
Where is the best place to buy this brace?
 

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Discussion Starter #12
Where is the best place to buy this brace?
There's a few places that sell it. Just search Halo Camaro brace.
Oh thanks. I'm just worried it may be the same issue since it looks a lot like the same design as the one I already have....just stronger materials. I might give it a try anyways. Thanks again.
 

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Looked at pictures of the Halo brace. The op’s issue of rattling with the exhaust is no different and ground clearance concerns are no different.

Maybe get some of that muffler/exhaust tape and wrap it around the pipes where they would contact the brace. Or just wad it up and stuff it between the pipes and brace.
 

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Didn't locate one specifically for a 2009 Pontiac G8. Therefore, assumed what they're referencing is listed as a 2010-2015 Camaro Driveshaft tunnel brace on the halosupercars website.
 

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That is what washers are for. Stack 2 or 3 under the brace at each bolt and you will have your clearance . Or loosen every clamp on the exhaust. Then place a 1/2" or 3/4"
piece of wood between the X-pipe and the brace. Tighten everything back up. remove the wood and you should have the clearance you need. Either way, the brace is there for a reason.

I would try the block of wood... costs nothing but some time. I was going to say the washers are the ticket but your tunnel brace looks way different than mine, and lower to begin with.


-J
 

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Didn't locate one specifically for a 2009 Pontiac G8. Therefore, assumed what they're referencing is listed as a 2010-2015 Camaro Driveshaft tunnel brace on the halosupercars website.
That's the one.
 

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Looking at the photos, the OP already has a drop down brace like the Halo brace. I say the exhaust was not installed properly. It came loose and sagged and now drags. It needs to have ALL the connections loosened up. It needs to be held up in place while the clamps are tightened. Not something you can do in a drive way. You may want to pay an exhaust shop to do this on a hoist with the proper stands to hold up the exhaust
 

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I've had to readjust my kooks due to catching gravel on inlaws driveway. And again due to age of exhaust. It torques with time and pulls itself.
I've done it in driveway just got to get car up high enough to get extra jack stands under car. Using hydraulic jack and solid to hold in place along with something under center brace.
Always thought that the brace was there to help hold exhaust up when working on it. Other then that it seems useless.

I would try to get the exhaust up high enough so it's not hitting the brace. If its sagging now due to torque it could go lower. Exhaust that big is likely to get hit ever now and then.
Like other post said unbolt exhaust from header flange back and slowly tighten from front to back. Once in position.
Good luck.
 
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