no proper waveriding at muriwai! i am hurt (my local)! lol - i have just witnessed keahi get shacked on a double overhead monster there. i think i know what you mean tho- not down the line... usually ..but my god nw downwinders are sooooo sick . can be a bit of a washing machine but soooo many faces to hit, even 3rd reforms can be sick with multiple turns, stickin up for my local... i'd swap it for pungarehu with a perfect sandy launching area in front tho.... dream on...
Muriwai is an epic location. Not many places you can do a 50km down winder with car support driving right next to you. I've been in the muriwai washing machine in solid head to double head and it is a powerful place. The waves jack and dump scary fast. You definitely don't want to get eaten by one of those monsters.
But I am ruined for waves. Anywhere else I have been in the country simply doesn't even come close to my local on an average day as far as waves/wind angle are concerned.