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Solved exhaust drone on 2 in / 2 out B&B
I have an 86 Targa with B&B headers with heat and a 2 in / 2 out muffler. The Billy Boat muffler was too loud and had a bad drone. I replaced the muffler with a MagnaFlow muffler. I picked up a bit of low end torque with this muffler. Overall volume came down. Great sound above 3K. However the drone between 2k and 3k could make your head split. I just installed a Dynatech Vortex into the driver's side outlet. Overall volume might be down a tiny bit but THE DRONE IS GONE! It now sounds great at all rpms.
This should work for all 2 / 2 muffler systems. Better than capping one outlet.
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