RE: monster pirate hop-ups
The best engine would be the Ofna Picco .26 (buy it from a reputable seller on ebay, RCBoyz(will cost about $170, £94)), fit the 2 speed and a pipe like the Ofna 086.
I have that all fitted to my Dominator and it is wickedly fast. I have also just bought all the aluminium suspension upgrades from a seller on ebay
for a fraction of their retail cost.