Hey y'all, I been wanting to get an ER catted downpipe, but I also want to install a tune at the same time... I was wondering since I have a 2015 320i, what is the best stage 1 tune I can buy to get rid of the CEL? And would I have to install other parts so I don't have problems with the car? My warranty is up soon so I don't want to have major problems.
