I ran my my discovery 5 port and i can say at this point.I like it better than my werks b5.It idles very well,easy to tune, make great power.It really feels like sirio kanani evo 4 sti because it is very smooth but if u want the power it will give it to you at will. I cant believe it a $200.00 engine. it runs that well. it is a really good buggy engine btw 9 mins run time and not fully tuned yet.