JB4 N54 2 STEP / NLS Relay cla35 Catless downpipes are considered a

Catless downpipes are considered a standard upgrade for any F80 M3 owner looking to safely push their S55 engine beyond basic Stage 1 tuning

more aggressive engine sound with the large air filter and intake tube

Lifetime Guarantee on Parts and Labor: S&B Silicone Body Mounts are designed for durability and backed by a lifetime warranty on parts and labor

delivering superior filtration and engine protection (Patent Pending)

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JB4 N54 2 STEP / NLS Relay cla35 Catless downpipes are considered aJB4 N54 2 STEP NLS Relay This add on kit for BMW N54 engines allows your JB4 to "2step" the engine (cycle power to the coils) to build boost when not under load. Useful as both a noisemaker for both manual and automatic transmissions, and for launching with manual transmissions. It also allows No Lift Shifting (NLS) for manual transmission cars. The relay kit requires a JB4, back end flash map, and BMS data cable or JB4 mobile connect kit. Note that