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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 06-17-2013, 12:04 PM   #1
JRT
 
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Need Advice...SOLO HFC + MACH XL Cat-Back = Saggy Exhaust

For the second time my SOLO HFC and MACH XL cat back is sagging at the cat\catback joint and clanging on my tunnel brace. the first time the dude tightened back up and tack welded the band clamps.

I do not understand why there is no factory hanger on this exhaust anywhere except all the way in the back. And I do not understand this mesh expansion joint that the SOLO cats have. Seems like a good way to generate a leak.

Should I have the whole system welded? Will that hold it up or create fracture point at the cat\catback weld? Is there another way to hang it up? I just hate to weld it because then it is permanent.

What ya guys think? Thanks!
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Last edited by JRT; 06-17-2013 at 06:02 PM.
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Old 06-17-2013, 02:08 PM   #2
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Did you contact Solo? The mesh expansion joint is for vibration isolation. It is needed on the L99s (auto trans) because of AFM.

I don't recommend welding any stock aftermarket exhaust for the reasons you mentioned plus you pretty much won't get any support from the manufacturer after that.
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Old 06-17-2013, 06:00 PM   #3
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OK, the AFM vibration makes sense now though it doesn't matter to me as I have AFM tuned out. I don't expect any support from them because I bought the full exhaust used on this forum.

Has anyone made any kind of support brackets coming off of the tunnel; brace? Ones that are isolated as to not produce NVH?
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Old 06-17-2013, 06:16 PM   #4
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Most people run into this problem with the 3" systems. The easy fix is some washers on the tunnel brace for a bit of extra clearance.
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Old 06-17-2013, 07:27 PM   #5
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I have 3 or 4 washer on the tunnel brace already and now this system is sitting right on the brace. I do not believe anything is broken, but It rattles like a box of rocks. This system is flat out hanging with nothing to support it so either it gets weld together, some kind of brackets off of the tunnel brace or welded to the body.

Anyone run into this and want to share their solution?
Thanks a bunch!
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