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Old 04-29-2003, 08:20 PM   #1
DrBoy01
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Default Strange vibrating noise after installing Kartboy hangers

Recently, after installing my Stromung SS catback along with a set of Kartboy urethane hangers, I've noticed that the rear of my car "vibrates" at about 1k-1.5k RPM.

No, I'm not talking about the exhaust note, lol. "What's that rumbling noise? It sounds like a motorcycle follows me wherever I go!"

Seriously, what I mean is that I feel the rear of the car shaking, as if the exhaust was rubbing up against some of the underbody. It only happens right as you start to rev the engine from a stop.

My question is, where the heck did this come from? I don't know if this could be from an improper exhaust install on my part or from the change in NVH from the Kartboys, but it's a minor nuisance that I'd like to get rid of.

Sorry if I put this in the wrong forum, I figured since it had to do with the Stromung catback that I should put it here. Mods, feel free to move this accordingly if needed
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Old 04-29-2003, 08:39 PM   #2
joefocker20
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My car does this also, its because the muffler is resting against the rear diff, I have a bad rattle until my car warms up too, which I assume is the heat shields..
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Old 04-30-2003, 08:11 PM   #3
MBPEJ20
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Question stromung catback

does the stromung catback rattle against the rear diff protector?

just wondering cuz i was lookin into gettin this catback also, and i have a rear diff protector.

thanks
Vic
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Old 04-30-2003, 11:18 PM   #4
silent_rob_95
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I have the same problem with my STi exhaust. At first I thought it was the heatshields. I think that they are stiffer and they don't absorb the vibrations as much and make the muffler rattle. Not 100% sure on that.
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Old 04-30-2003, 11:52 PM   #5
joefocker20
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I think it is the heatshields, I installed Kartboy hangers because of the rattling to attempt to make it go away. And I don't have a rear diff protector, my exhaust rests right up underneath the rear diff..
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Old 05-01-2003, 02:51 PM   #6
silent_rob_95
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Hmm... maybe it is. But my exhaust has about a 1/2 fist space between the diff and the pipe. I don't know
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Old 05-01-2003, 03:17 PM   #7
joefocker20
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Yeah the STI may have different fitment, but I have the Stromung for GC8s, and mounting it on Kartboys was a biotch and a half..
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Old 05-01-2003, 04:08 PM   #8
silent_rob_95
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It was hard as hell too man for the STi muffler. The hangers are very hard. All I did was add some grease and that helped them slide right in. I am thinking about putting a bit more grease like if they were bushings. Maybe that will help. Hehe. I'll think about it more today.
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Old 05-01-2003, 04:16 PM   #9
joefocker20
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I doubt it will help. I wouldnt do it because you may run the risk of your exhaust slipping off. It would be a minute risk, but still. I've given up all hope of getting rid of vibrations.. Between my Borlas, Stromung, Kartboy Hangers, Whiteline Diff lock kit, Kartboy Shifter, and STI suspension I should be picking up today I would probably never be able to get rid of vibration unless I took the Kartboy out and added like 200lbs of Dynomat to my car. I would never do that of course, I'm more interested in taking weight OUT of my car.
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Old 06-05-2003, 04:17 AM   #10
OMAHA2.5RS
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This morning I installed 3 Kartboy hangers (the 3 rearmost ones) and I have the same problem that DrBoy01 describes. Just after starting out from a stop, at about 1000-1500 RPM's I get a buzzing/vibration from the rear of the car. My exhaust was hanging a little low and moved around alot so I decided to firm it up. I think I firmed it up too much. The exhaust is not touching anything, I think it is the stiffness of the hangers transmitting vibrations in the exhaust to the body of the car. The exhaust seems to boom more in the cabin around 4000 RPM, especially when I lift off the throttle. I'm thinking leaving the 2 on the backbox and changing the next one forward back to stock. Does anyone know of a harder rubber hanger that is a compromise as far as stiffness between stock and the Kartboy?
Thanks....................................Doug
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Old 06-06-2003, 03:12 AM   #11
joefocker20
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Between my Stromung, catpipe, Borla's, Kartboy Shifter and Bushing, Kartboy Exhaust Hangers, and other parts of my car, I have so much NVH that I just starting ignoring it..
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Old 06-10-2003, 02:32 AM   #12
ferretboy
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Default guys check your resonator or muffler tip!

Hey all,
I installed the same little bits and got a rattle and vibration sound too. After closer inspection, I found out that my resonator was rattling against the heatshield and also that the tip of the muffler (magnaflow/Rallispec) was rattling up against the bumper beam. I bent the front heatshield away (upward) from the resonator and had to actually trim a small crescent shaped piece about 1/4" max from the bumper beam so that the muffler tip no longer rattles against it. Try looking to see if those are your sources of noise.
~ferretboy
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Old 06-10-2003, 11:26 PM   #13
quicksilver
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I had that problem as well with my Borla headers, Random Tech cat, and Stromung SS cat-back with Kartboy hangers. Mine came from the cat slightly rubbing against the crossmember. joefocker is right, putting those Kartboy's on was absolutley horrible!!! What's even worse is taking them off without having to cut them!

-Mike
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