well, weather its himoto or the other company, they both have engine replacement programs. The sh.18 has alot more power than the vx. The os cvrx has great power and is pretty much a direct replacement like the sh but will cost more money. I dont know about the lrp since i have never owned one, i like the power and ease of tuning with the cvrx for sure or any os engine but i have had no problems with the sh.18 either and they have plenty of power.