They aren't fun to get to.. but they are doable.. search here will bring up a few tips on them.. And here is your "top of the line" versions..

NGK Iridium IX Spark Plug Set Stock Heat range

And there is a thread on easy peasy throttle body replacement.. here's some leads on the 74mm.. which is what you are running..

https://www.crossfireforum.org/forum...y-upgrade.html