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SPL RUA F3X
an ECU tune or CEL fix will be needed to avoid a CEL from displaying on instrument panel
Blue Anodized Titanium Socket Head Cap Screws
If your looking for S58 tuning for your 2021+ G80 M3 or G82 M4 the JB4 is a perfect S58 engine tune
Due to utilizing the OEM electronic diverter valves
BMS BMW B38/B46/B48 JB4 Tuner Optional Connection Device:None SPL RUA F3XPower gains of up to 100HP on a stock vehicle without the risks of flashing! The JB4 is the most advanced and highly featured tuning system available for your B38, B46, and B48 powered BMW. Power gains are up to 40hp to the wheels (55hp crank) for a B48, gains with bolt on parts, higher octane, E85 mixtures, and larger turbos are even higher. The JB4 features a simple plug & play installation harness for easy installation & removal and includes many
