![The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion](https://ls1tech.com/forums/attachments/cadillac-cts-v-2004-2007-gen-i/609879d1501326500-cure-drone-1-4-resonance-pipes-aka-j-pipes-aka-helmholtz-tubes-img_20110205_210528.jpg)
The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion
Best Resonator to Remove Drone but Keep Sound? Or a Valve Solution? | 2015+ S550 Mustang Forum (GT, EcoBoost, GT350, GT500, Bullitt, Mach 1) - Mustang6G.com
![The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion](http://www.cadillacforums.com/forums/attachments/2009-cadillac-cts-v-performance-mods/96693d1346186459-muffler-delete-helmholtz-pipes-v-exhaust-installed-c_sm.jpg)