Spark Plug for 4AGE BT 20v engine is IK20.
For further information, u may refer this website
http://www.globaldenso.com/en/products/aftermarket/plug/basic_knowledge/heatrange/index.html
what is the best tire for 165/55/14 cause very hard to find, ask around have so many answer. i am just driving a "SLK" only.... pls share, still a noob in this area. thanks