HKS Spark Plugs to suit M177-M178 4.0 litre BiTurbo engines. (set of 8) A noticeable difference in performance over other brands. Iridium Alloy Center ElectrodeIridium alloy center electrode reduces voltage requirement...
MANIFOLD CONSTRUCTION The factory manifolds are constructed from plastic, in 2 halves and then plastic welded (melted) together) This construction method is economical for large scale production, and (mostly) ok...