The basic requirements for a properly running engine are fuel, air, compression, and spark. Before cranking up the power in your BMW, it is wise to ensure all maintenance is up to date and these processes are performing as intended. Weak spark from your ignition system can result in misfiring under high load driving, and spark blow-out under high boost, which is bad for performance.
Fits: BMW 1M (E82), BMW M3 (E46), BMW 135i/335i/535i (N54), BMW 335i/335is (N55). Confirm fitment with us before ordering.
