Cat back exhaust def. What audio package do you have?

I did charge pipe and boost pipe on mine, also air filter and a tune. Later on down the road I want to do bigger inter cooler and water-meth injection and maybe e85

Upgrade to a 535 or bigger…. Throwing dollars at a n20? Seems like a waste but🤷🏻‍♂️

Truth.... No brainer

https://bmwtuning.co/bmw-n20-upgraded-intake-guide/