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These plugs are perfect for the N54 with any upgraded tuning. 1 step colder plugs work very well on my stage 3 turbos with .02 gap and 485hp. the plug replaces the discontinued 5992 plug.
Verified purchase: Yes | Condition: New
Best spark plugs for a 2007- N54- N55 - S-63 (tu) - or non - if you have your car modded - if not still amazing/ colder then stock so once you have a non stock car Tuned w/boltons - or whatever this is the best plug you can get for a turbo or TwinTurbo vehicle! Period (if you have worked onto the vehicle they should be gapped at. 22–. 24 The stock gap of the plug is .16 - just fyi 
Verified purchase: Yes | Condition: New
These plugs are great and the only ones that I use in my BMW 750. They fire smoothly and allow the engine to be smooth running. The price is fair and they run great.
Verified purchase: Yes | Condition: New
I feel a whole lot more horsepower with these!!! great buy
Verified purchase: Yes | Condition: New
Great product....noticeable power from stock plugs...great value...won't be disappointed...
Verified purchase: Yes | Condition: New
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