Using "J pipes" to remove drone

[falcon_bandit]

I dropped the twin rear mufflers on my aurion to see how it sounded, and surprisingly these engines sound quite nice, and a perfect loudness. Was happy to get straight pipes made up in there place, until I realized there was a sonic boom at roughly 2300rpm under load which is pretty deafening.

At first was thinking couple large resonators but am worried will kill the sound too much. So then maybe a couple hotdogs, but worried they won't do anything. Came across the j pipe theory of removing drone & want to do a combo of hotdogs & jpipes but I'm a bit confused how to work out the correct specs for the jpipes. Can anyone help?

[falcon_bandit]

OK finally found a good calc to work it out for anyone looking to do the same
https://www.performancetrucks.net/fo...-drone-489463/

In my case, I worked out the frequency to be 115hz @ 2300rpms on a v6, so I need a 29" jpipe 🙂

[SumoDog68]

It sounds like you are building Helmholtz resonator .

[falcon_bandit]

Has anyone here had success with these?