hi there whats the best make and type of spark plugs to fit, ive got a 3.5 efi with hotwire injection think the compression ratio is 9 to 1

do the more expensive bosch super4 plugs and the like make any difference at all, are they work the extra expense. cheers

Just run with a grade cooler than spec and you should see a difference in starting I have always used Champion as supplied and fitted by Land Rover in 3.5's and 3.9.