Thanks for the input. I'm leaning more towards the Tower .75 right now with the Evolution 1.00 running a close second...the only thing turning me off of the evo are the ratings here on RCU. I'm not planning on using a pitts muffler, simpling drilling a hole in the firewall and fuse to route the muffler and exhaust out [link=http://www.rcgroups.com/articles/rcpowermag/2006/jan/p47/muffler_hole_2_edited.jpg]Like This.[/link]