I found the walmart brand works fine for me, I used split fires in my explorer didn't notice a difference. Used a split fire in my quad and I could feel it so you might try paying for the split fires and see if they work.
87 Samurai. S-10 Buckets. Cherry Bomb exaust. 2" lift shackles, 30-9.50 Wild Cats
2000 Chev Tracker 235/75 wild cats
If you ain't wheelin get outa here!
I'm running Autolite copper cores at .030 and their great. I had a set of Splitfires....CRAP.....I had a cracked electrode after 5000 miles and went through the whole system and a intake manifold before I checked my "brand new" plugs I was pissed. Don't waste your money on "performance" plugs you will not notice a difference. There is just not enough spark in the stock system to make them worth the extra $$. Just my .02
Check this out. Can I run a larger gap if I have one of those big coils? (no, not the 100 one, the 30.00 one, says like 40kv or so.. I took a spark plug wire off a plug once and it arked like 1.5~2 inches!!!!) Yes, no, try and see???
Nowhere, don't know if this would cause problems on a zuk but chevy/ford guys report 2mpg increase with .060 gap and $40 MSD 40Kv coils. When i get around to ordering a coil i'm going to run .06 and see what happens. This coil prob won't last much longer anyway (FORD).