Ok im sure this was asked already but i cant find it. whats the difference in the plugs from the dealer and the after market ngks besides price? which one is recomended the dealers $25 plug or the other plug. peformance wise can anyone help me

 

there is a standard NGK Iridium plug that comes in the evo stock. there is a copper NGK that you can get, but you have to change them a lot more frequently. then there is a higher performance NGK IridiumIX that you can get. It is better than the stock Iridium. all 3 are listed under the evo on NGK's site.