Artemis is a must for splatcat. XL275 and XL280 weights the same so XL280 is better if you want to drop engine rating
Due to the Splat decrease quirk I have decided to see how this build is doing. Obviously due to ghostheat you will have to alternate fire left and right now. Build is obvious. Suggestion in tweak include more ammo in place of armor/DHS. Not suggested for CW. BONUS! "Splatcat Lite 2.0" Less firepower better sustained DPS. I prefer doing it with a KTO instead though.