[Beemer5to3]

Hi all,

I've just put a deposit down on a late 2020 840i. I can't wait to get it, but do fancy giving it that little bit more oomph!

What tuning boxes are people using and has it made a real noticeable difference? Any issues caused?

I'm looking at TDI Tuning's box as I've used them before on a previous car and the product and service was very good.

Thanks in advance.