Post by
tollboothwilley »
https://forums.nicoclub.com/tollboothwilley-u74535.html
Thu Mar 26, 2009 8:18 pm
I've heard a lot of good things about the ZEX kit, i've never heard of the other one.
Depending on when/how you drive your car, you might want to think of using 1 step colder plugs. In a hot climate or frequently high revved engines it can be beneficial as well as prevent knocking.