Originally Posted by Vic311
I believe it.
The Nissan 350-370 crowd have been running them for years and they have a few aftermarket applications tailored with branch resonators.
I am not sure why a tuner hasnt stepped up to produce these for our cars. Something designed with carefully calculated sizes and lenghts (no offense to your math skills
Folks seem intent on welding straight through resonators in the Xpipe but branch resonators in the rear section is what really eliminates drone.
The Active Autowerke exhaust for the E9X M3 has Heimholtz chambers.