B58 buying guides
Straight answers from our own builds, before you spend money.
B58 Gen 1 vs Gen 2: How to Tell Which You Have and Why It Matters
Gen 1 is the original B58 (engine code B58B30M0), found in F-chassis cars and early G-chassis cars like the 2017–2019 540i. Gen 2 is the 2018 "technical update" or B58TU (codes B58B30M1 and B58B30O1). It's in the G20 M34
Read the guideBest B58 Mods, In the Order to Do Them
Start with a tune. It is the biggest gain per dollar on any B58. Then add a downpipe and a Stage 2 map, then an upgraded high-pressure fuel pump (HPFP) and an ethanol blend. Only after that should you think about a bigge
Read the guidebootmod3 vs MHD vs JB4 for the B58: Which Should You Buy?
For most B58 owners who plan to keep modding, buy a flash tune. bootmod3 is the polished, cloud-based choice with a big custom-tuner network. MHD costs less to start and keeps maps and logs on your phone. The JB4 is a pi
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