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Buzzing noise when accelerating

I have an '08 Civic Mugen and recently replaced my HID’s. Soon after I noticed a buzzing noise that gets louder as I accelerate.

Please help…

Disconnect the HID’s and see if the buzzing goes away. If it does it could be a weak alternator or the wrong HID’s. A good, independent mechanic can fix your problem quickly.

Maybe the buzzing is a rattling heat shield on the exhaust. You say this buzzing started “soon after” without saying how soon and an exhaust rattle can start at anytime.