[blackg20_330i]

Hey all, so I’ve been looking into options for a piggyback tuner (I am trying to avoid BM3 because I’d have to get a bench unlock and I don’t want to cause issues with the dealership). I am currently stuck between Jb+ and turbo transformer and slightly considering a jb4 as a more in depth option. I would like to know if anyone has had experience with TT or JB+ and if they have had any issues... also if anyone has upgraded from TT or Jb+ to jb4 if the difference is worth the money. I’m not looking to be running this 24/7 as my car is my daily and I don’t want to put any unnecessary stress on the powertrain. Any experiences and information is welcome I’m just having some trouble deciding between the 3. Also I plan on running the car at the local drag strip to see what kind of a difference it will make. Is it a good idea to push this motor that hard with these piggyback tuners or are they only safe when doing the occasional pull on the street here or there?