The JB4 for S58-powered BMWs is plug-and-play, not plug-and-pray. Fits G80 M3, G82/G83 M4 (including Competition and CSL), and G87 M2 - no coding, no cutting, no tears.
~80whp / 100wtq on pump fuel; up to 150whp / 175wtq with E85 or high-octane
JB4PRO app: wireless map switching, live logging, fault code reading/clearing
8 preloaded maps + boost-by-gear for sharper launches and daily drivability
Fully removable, not VIN-locked - track day ready, commute proven
