Coilpack Nissan Rb20/25det Series 1 Set of 6Nissan Rb20det Rb25det Series one 4 bolt RB coilpack When you are having issues with your factory coil packs in your vehicle it might tend to misfire and not run properly or run rough. Instead of buying 2nd hand and unknown condition coil packs these are a great alternative for factory power setups. Suited for the later model Rb20det A31 Cefiros, will also fit on earlier RB25det vehicles, R32 vehicles. Skyline R33 GTS t S1 ECR33 Skyline R32 GTR BNR32