I'm going to buy the helmholtz style resonators and weld them in, I feel like I have the best shot with those to tune out the specific rpm range I'm after. I'll follow-up with the results.

1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]