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640i Tune 7 Exhaust Questions!

1174 Views 0 Replies 1 Participant Last post by  joew5
Hows it going everyone, new to the forum as far posting goes! I have a 2012 640i Coupe that I would like to tune. I was wondering what everyones opinion is on tuning the 640i and any recommendations on what to do. Additionally, I will be deleting the mufflers and resonators tomorrow but was unsure if i should delete the cats as well and do a downpipe and if any codes or problems would come from that. ANY INFO IS WELCOME!