I like the UR5's, every one that comes out of a box is perfect I like the percision. I sure haven't found that w/ the autolites or AC....they sometimes have electrodes bent all over the place but I also haven't ever had a problem running any of the 3 types just like to see a quality plug.
I ended up getting a set of Accel u grove plugs before going to the track for spares incase something stupid happened with the Nitrous . Ill tell you guys for some reason i can now run 19psi of boost with my Reds chip wo knock where before i could only do 16 on pump gas The plugs was the only change . They are made by the Nippeenso or whatever i think they make the NGK i could be wrong .