from my knowlegde platinum plugs do fuck all for performance
they just need replacing less often....much less often.....be careful though if u get them dont attempt to adjust the gap
he's talking about iridiums, not platnum plugs.
i got my at bursons for $60 trade.. didn't make any difference, but then i'm using standard leads. i doubt upgrading all that shit will give any noticable gains anyway, but i guess they'll last you as long as 2-3 sets of cheap plugs so it all works out in the end.