got 2 types here. 1 is blue cables with black heads (RM100 - RM150 for 2nd's). Another is blue cables with blue head (Usually RM150-200 for 2nd's). The later is the better one. Old cable can cause kick back ooo... causing distributor to 'kong' faster.....
but best is spoons or nology (the ones which have individual groundings). These cables also store charge until max to provide maximum and consistent powerful flow of charge... woohoo... but blurdy expensive...
Some purist says, R33 is the best in term of power and ride & handling outshine its other sibling. I read in few mags confirming the R33 as the best Skyline with RB engine ever. R32 was perhaps the one that changed...