Hello, I have a 2015 m235i wrapped matte black and black interior +30% tint all around. M performance duel slit grill.
I am interested in making my car louder without changing the whole exhaust system. I have been looking into muffler delete or resonator delete or straight pipes. I know that altering some things will cause my car to read wrong and send the "check engine light". Any recommendations on how to get my car to be louder without throwing the "check engine light".
I also am trying to stay cheap and not void warranty
(pic of car is before window tint)