I know this may be a dead horse, but i still have have no luck with this sound.
Buzzing when i accelerate moderately or hard. From the behind the radio/firewall area.
I have new manifold and flex section gaskets, new header(manifold had a crack). And i had a new flex section welded in. The bolts were tightened in the correct pattern and retightened after a few drives. I have put a small amount of RTV at the flex portion joint.
No buzz when I rev it up in neutral.
No buzz when i accel gradually, under 2k
No Buzz when coasting or cruising.
I thought the once that the noise had lessened when a shop put in the new flex joint. But now I think it has not really gotten better or worse.
Any words before i pull out whats left of my hair? Thanks.
1st flex pipe installed and after i found a cracked manifold.