Recommended seller. I bought the K&N Filter and NGK filter from him a month ago. The filter doesn't make much difference at first while waiting for my ECU to adapt to it, but once the spark plugs is installed into my '93 Perdana SEi. I can feel the 'smoothness' of the engine right away. Compared to other Irdium Spark Plugs, for only Rm135 it's a steal!