I know of a couple piggybacks that don't really push the car that much. Have any companies began engineering performance mods or actual tunes?
Has anyone dyno'd after installing full exhausts? I've only found a few downpipe options so far with most not being stateside. Armytrix (only catback) being one of them and AC schnitzer.
Don't really like the remote, can you make it that the flaps open when changing drive modes?
https://www.armytrixusa.com/shop/arm...g30-g31-17-19/
http://www.acschnitzer-us.com/en/bmw...7/exhaust.html