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just get the oem bosch spark plugs prefrebaly the 2 pin ones as the 4 mite say they are ultimate power!! but they drain a lot more petrol!!
 
Ive gone for a set of NGK BKR7E-IX in mine, apparently every 75 - 100bhp (ish) more from standard you go you should get a colder plug.
Also running K04 at similar boost levels

i always get this mixed up is it the higher the number the colder the plu or visa version i.e 7 is hotter than 8 ?