BMW X2 M35i — the underrated hot crossover with real tuning potential

I have an X2 M35i as well and can confirm the tuning potential is excellent. The B48 in the M35i is the same engine as the M135i and responds very well to a stage 1 tune. I am running a JB4 piggyback tune and seeing about 330hp at the wheels.

For stage 2, the catless downpipe on the B48 makes a noticeable difference in turbo spool and top-end power. But be aware that the B48 in the X2 uses a different exhaust routing than the M340i B58, so make sure you get the correct downpipe for your specific model.

Regarding warranty — if you are still under warranty, the JB4 is a good option because it is undetectable when removed. A flash tune like BM3 leaves traces in the ECU even after reflashing to stock.

The X2 M35i is basically an M135i with a different body. Same engine, same xDrive system, same tuning potential. I chose the M135i over the X2 but both are great platforms.

One upgrade I would recommend for any B48 car is the charge pipe. The stock plastic charge pipe can crack under increased boost pressure from a tune. An aluminum charge pipe from VRSF or FTP Motorsport is about 150 EUR and eliminates that risk.