Im not sure about the LRP Z.18s, but I did put a Orion Wasp .18 Pro in one of my Terra Crushers. It has good bottom and mid but nothing on the top end not like the TNX .18. I have a O.S. .18-CVRX in one of my TNX's and I like it alot, a little better the TNX .18. But if you need a lot more power I would recommed the O.S. .18-TM (I have one in one of my TNX's) the TZ is alittle over powering for a lot of tracks, but it gets better fuel comsumption than the TM.