I heard that before all those fancy engine were available here a lot of guy's were running those in there buggy, if i believe what the guy told me at the LSH (he's been in racing for a long time now) those are top of the line engines, and they make engines for other well none companies out there don't ask me which one I don't remember, They are made in France. The TM323 is a .23 5 ports and if you go with the kit it include the engine, pipe and manifold. They don't give any info about rpm's and hp but by what i've read on the net. they have enough power to turn your Revo on the top even if you change the gearing.
http://www.rbproducts.com/mainEn.php

direct drop in and it comes with its own enige mount and the Traxxas electric start fit on it.