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
I just wan to ask around that Do anyone of the E7/8/9 owner wanna to let go their KNN drop in Air-Filter if not using it ?? Please contact me via PM....TQ