I don't know but as far as performance the stock exhaust is maxed out for performance unless you do mods with custom chip from what I have been told..

I was always wondering what the hellcat would sound like with a xpipe and some stainless steel pipes and mufflers

 

I have replaced the stock x-pipe for straight pipes, but kept the rest of the exhaust stock. It sounds incredible good and even louder as with the x pipe. No drone or rasp at any speed. Finally it sounds almost like a V8 should sound from factory

 

Well we do have an x pipe but the collector is pretty tiny. The Carven one has a massive collector.

 

You will need to change the entire exhaust system if you are looking for a bigger xpipe. I guess you could have one custom made if desired.
I am running a complete 3" ARH system with a 3.5" xpipe and 2" LTs.

 

I agree with CFPCOOL. I have done a lot of research and the factory exhausts systems are super efficient and no power gains from just exhaust mods.

 

Likely minimal unless you port and tune.

 

When I built the 3" exhaust for my car I made a proper x-pipe from scratch. The exhaust has larger mufflers, AEVs, and smaller diameter resonators - again all bespoke solutions and custom made. The sound is comparable to stock which was the goal.

 

Not looking for any power gains fyi, just looking to clean up the sound even more.