I bought the Zex direct kit for my 2005 350z. I'm only planning on running the 55 wet shot. Do I need to run colder on my plugs? I've read that these cars run like trash on one/two step colder plugs... Any info helps. Also, I have a Walbro 255 fuel pump, should I install that with stock fuel injectors or leave it alone until I upgrade the injectors?. Appreciate the help.

 

..bump..

 

If you're running a wet shot you don't need to upgrade injectors. Fuel pump will help. I ran a 100 shot on my stock pump, ran a little lean on the upper rpms.

Since I have a 08 I ran the 370 spark plugs, one step colder. They burned up pretty quick but idled normal, might have to tweak the gap to better suit you.