Muffler delete vibration and drone

crazy4oldcars

Someone did a post a while back about adding pipe 90 degrees to the tail pipes to cancel the drone. He used science and everything.
As I remember it, he had a drone between 2k and 3k rpms, and calculated he needed to add a 19 inch long capped piece of pipe to each tailpipe to cancel it. The way it was described, it sounded like each different setup (brand, components used, etc.) would need to be calculated individually to get the full benefit. The calcs were based on the sound frequency of the drone.
It also sounded like you would need some fairly sophisticated equipment to measure the sound.

Kirk B.