These OS engines are just sick. I got a VRZ-B .21 racing engine for my JamminX1CR and it's just as reliable as my CVR-X .18, it is a total beast just like the .18 except this one is totaly nuclear. Anyways, fo me, it's gonna be OS all the way for any cars I will buy in the future. I've seen fancy Collari and Nova Rossi installed on many cars but they all end up giving trouble in the end.