Rep Power: 0

99 honda civic ex auto trans. Is the A pipe buzz that happens in integras also the same for my car? i have a new stock muffler (changed it twice still buzzes) and a dc header (came with the car) and new cat, and i get the loud buzzing sound from 1200- 3000 rpms... Does this header have the pipe inside a pipe ? or is it a different pipe im looking for , for that? All exhaust hangers are new and the clearances are fine. The cat heat shield is not buzzing under load its been checked by 5 different places. One place cut each piece at a time (muffler, then cat,) then when they got to the header they said the header was the cause of the loud buzz. It was so loud though, i couldnt tell if it was buzzing anymore... any ideas??? I know this topics been beaten to death but with having new stuff installed and still the buzz im lost.. The muffler i put on is stock... there is no resonator either... every place tells me a resonator wont help, true or not? Its a metal on metal sounding buzz so i assume this A pipe thing is to blame?

 
Rep Power: 812

most honda downpipes have a pipe within a pipe, yes. i ended up ripping out all my heatshields (there were 4 i think) and most were buzzing due to rusted bolts being loose.

 
Rep Power: 0

mine buzzes at 2500 rpms becuase it hits something near the rear axle, could be the same for you man.

 
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So are you guys running a resonator? my buzz is only on acceleration. After that its smooth and quiet while moving.... I like quietness. Thats what i want. I now also hear a gurgle sound in idle ,in drive, and super low rpms ! since its gotten cold. Its definitely coming from the back of the new muffler , sounds horrid ! any ideas there??

 
Rep Power: 217

My Civic would buzz or hum around 2000 rpms. It actually sounded cool....until I went to the car wash. Once the water hit where the noise was coming from, every time I shifted, it sounded like something getting squished . Mine turned out to be a resonator.

 
Rep Power: 0

So gearbox; if my heat shield looks fine, and not hanging, and the bolts aren't rusted and tight, doesn't this rule out the possibility? I see only one heat shield on my car. Which is under my cat. The header doesn't have any. And where would the rest be ?

 
Rep Power: 812

above the exhaust pipes and muffler

 
Rep Power: 0

Is the downpipe the pipe that connects to the header??

 
Rep Power: 812

yes.

 
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Oh So you finally decided to use a period gearbox? haha kidding. Thanks for the info. Im gonna rip off the heat shield just in case, use jb weld in the pipe in case its broke lose in the downpipe and i dont think theres a gasket there at the downpipe . What would that cause?? buzz??

 
Rep Power: 812

you may have a small exhaust leak too. that donut gasket is hard to get it sealed properly.

 
Rep Power: 0

I found the gurgle vibration sound is the new muffler vibrating off "something" on the bottom of the car yet i cant see it. With the car in idle i can hear it in the trunk BAD, so i got out pushed down on muffler and it stops. What could it be? 5 shops now and no one can figure it out.. Does this sound an internal muffler problem ? Theres plenty of clearance. I dont see it vibrating on the undercarriage of the car. What else would it be vibrating off? its own hanger? (it was re-welded) Same **** happens.