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i would also recomend NGK's they are great plugs and that is also what the factory recomends. sometimes it say's so on the timming cover.

just becouse it dosnt say vtech dosnt mean its not i have a buddy with the 93 si too. and his valve cover dosnt say vtech and it is.

well i know to use high octain i was just thinking you may have used race fuel. i have a supercharged del sol and i only run 93 octain. but i just think that 400hp is crazy on a d series. but that turbo is huge. anothere question though with that turbo are you haveing to wait for it to spoil up...

also what vitara moter did you pull the pistons out of?

I have a couple of ?s. What octain fuel are you running for the 400hp,and how well was it tuned? At the strip what type of tires did you use? Did you have to bore out the block for the vitara pistons? And what piston rings did you use?