I'm a big NGK fan myself, using the only dailies and racer.
Their website used to have a big database of cars, and their nkg codes. There is also a break down of the codes, if you want to work out what differs between an s8 and an a8 4.2 plug.
The 4 prong ones are for long life - electricity takes the shortest route, and your doing well if you split it into 4 sparks!!!!
Singh - may I ask how much the audi ones where? As I have a receipt for the previous owner paying £12EACH for plugs + labour! But don't know what he got for his money.
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