exhaust buzz

loud buzz at high rpm heat shield off and catalyc straight pipe still
buzzn new catalyc still buzzn

is it your cat or is it the baffels in your muffler rattling? I have a monza on my CRX and my Fiance's Prelude and they both grew a rattle in the muffler.

make sure none of the exhuast hangers have fallen off, and that they arent rubbing on anything.

not the mufflers. coming from the middle. I have a b16a1 whos knows what header ive got.

I have the same problem but it isn't any rattling of the pipes.. I have a high flow catalytic converter and I had my resonater taken off.. The resonator looks like a catalyic but its built into the exhaust...My muffler used to have a deep tone but since I had that resonater off my exhaust sounds like a peice of tin rattling. It sounds like shit

I have a 96 dx with B16a, i was at a friends trying to fix my reverse light while messing with both sensors on the transmission using the test light (shouldnt of done that) after fixing the reverse light, started the car up check engine lights up with the code 25 blinking 2 times slow then 5 fast. Dont know the code 25 but 2 and 5 are the o2 sensor and map sensor then as i pulled out of the drive noticing that the speedometer didnt work, then after drving about 10-20 mins my car Radio dies, cluster starts to dim, headlights gone too,
o yea i had the car running couple of time to when seeing if the reverse light would come and testing the sensors too.
i had to shift down everytime i felt the throttle was not giving using only 1st to keep on moving of sudden the car dies. My friend gives me a jump car moving fine but same thing happens everything dims almost made it home. test the battery it was good. Alternator havent test. Anyone here with any idea what could be this mystery electronical problem before i waste to money taking my car back to hondata on something little. Now my car starts up fine but engine light still on and speedometer dont work but i took the car for a drive to see what would happen nothing happen with the light dim or any throttle feeling
Anything pleasssee! Thanks

If you removed your resonater that is probably what it is. Had my exhaust done had resonater removed rattled at high rpm. Took it back to muffler shop had a new resonater put in sounded great no longer rattled.