Hey,

i have a slight issue. I installed an akrapovic axle back late last year and have been having all sorts of issues with the fitment of it.

I have ARH headers/off-road mid pipe and only when the car is warm (up to operating temps) I get a noticeable interior vibration at 1500rpms only. It rattles the passenger side seat area and the whole rear hatch area.

I did not have this issue with my prior b&b axlebacks, only the akrapovic. Has anyone else had this issue with their exhaust and what was your fix? I cannot find any noticeable rubbing marks but the passenger side tube is really close to the trans casing.

Is this a case of the exhaust rubbing somewhere? I’m guessing it could be the clamps rubbing the tunnel area or the tube hitting the trans case.

Any help or insight? Or anything to look for?

The car is cammed too but I don’t think that should matter? I also installed the Pfadt trans mounts? Could that be the issue?

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No I don’t think so. It’s not necessarily a buzzing sound, it’s like a rattling sound. Like a bad rattle from an exhaust tube hitting the body because it rattles the passenger side area and the whole back of the hatch area. But I cannot see any where it could be rattling at. I’m at a loss. I think it might be the clamps for the ARH midpipe hitting the body when they’re warmed up but I don’t know.

Did you have have any clearance issues with your akrapovic system?

It doesn’t sound like that. I had Lingenfelter add their tank expansion to my oil tank and added a aviaid tank insert and my o-ring looked like new. That sounds like a tapping sound, right?

either way, thank you both for the responses! I appreciate it. I’m about to give it to a local shop to diagnose the issue because I’m close to being done with messing with this thing.

i had that shifter rattle too but switched to the MGW shifter with their box and it solved that issue. For the price of the akrapovic, you would think the system would just fall right into place. My system is way too long for the car and doesnt have any wiggle room for adjustments. The muffler hangers end (the bend part) is right up against the rubber mounts.

What did you do to fix the issue you were having with your corsa’s?

Im going to knock all these potential problems off my list so thank you for the suggestions!

Honestly, I’m not sure because once I got under the car and started hitting things with a rubber mallet, everything seemed to rattle. So I fixed the hangers mid and muffler, gutted my cats, Silicone the free floating washers to the bumpstops on my DRM Bilsteins, and trimmed the heat panel under the trunk for the Corsa’s. The rest of the stuff looked alright but had the potential to rattle. One of those things fixed the problem.

I’m going to order new hangers for the car (figured it’s time after 13 years). I should have done that when I added my cam but I don’t know what I was thinking. My heat panel is kinda smashed on the passenger side because I didn’t know I had to drop the damn trans just to get the akrapovics in. The bent corner of the heat shield (under the trunk) might be rattling against the body so that very might as well be the culprit. My DRM Bilsteins don’t rattle but I might copy you and silicone the washers.

what axle back system do you have?

are your primary tubes close to the trans cooler lines at all?

Try hitting your rear shocks with a rubber mallet. If they “jingle” it is the washers. Spoke to Randy at DRM and he said I could remove them as the vette rarely if ever bottoms the suspension. Instead I just bought some marine grade sealant at Home Depot and siliconed the loose washer to the rubber bump stop. Worked great.
Corsa said my exhaust can expand almost 1/2 inch when hot so just because your clearance is good when cold it changes when hot. Also the exhaust changes when the weight is on the tires vs. when jacked up. I wrapped all tubes and lines around the rear diff with DEI insulating tape in case there was contact as well.