So i really wanted to get the JB4 tune, i did the CAI and went to the exhaust shop got a new muffler and he deleted the secondary cat? I had no idea i had 2. Anyways he's saying they never mess with the down pipe and thats where my primary cat is! I really want to run a stg 2 JB4 but i dont think secondary cat removal and resonator delete is enough. :( Could i get away with a stg 2? So far im so happy with how it sounds and it seems if i make it any louder i will get drone.

Any help is appreciated!

 

For the stage 2 you will need to remove the down pipe cat for the extra exhaust flow. What you can do to reduce the drone would be to add a resonator when the 2nd cat was.

 

The Dinan Elite doesn't require a different downpipe and works with your warranty. I work with and know people that have them on the F56S without any issues. Stay away from the Dinan Sport.

 

Why do you say that? Does the Sport create problems?

 

With all the issues I had and reading about others here that have had their issues I'd stay away from the Elite as well. Easily the worst mod I did to my car.

 

Honestly, get an ECU flash tune. Its a lot easier and less problems. Look at @Bytetronik and their tunes - https://bytetronik.com/

 

For Stage-2, upgraded IC and DP (+exhaust) are recommended.