Hi everyone. Getting ready to do some minor tune-up items on my truck. One of those being sparkplug replacement. I am going to be installing M-12405-3V12MM plugs (I have the newer heads in my truck). Couple questions...

1. Any difficulties I should be aware of replacing the rear plugs with the Whipple sitting on top? Looks like it's going to be a major PITA. Any suggestions to make it easier?

2. Any suggestion on the proper gapping? I am running 16psi.


Thanks