Cmon guys, it's not really fair if you only give a guy half the information he needs. You have to perform a cylinder head port to cope with the extra compression ratio and flow the engine will now need. The Honda Sandbag method works best
Instructions here:
http://www.audiforums.com/forum/showthread.php?t=80267
BTW, the idiot in that instruction thread went wrong because it doesn't work on German cars, only Japanese so with a Skyline you'll be sweet