You can use the tweaker, to add another cylinder to the XRT, i currently have a .eng for my xrt and with another cylinder would sound awesome, so i guess we just gotta wait for Tweak X
not bad, but i think u need more roar in it, and i have some soundfile's wich have the RPM turned up from some reason, wich is quite necessary for this sound to, nice base sound though
EDIT:sry, read it wrong, i have demo vesrion, u said use it with tweak, wich i can't use becuz i'm DEMO user, can someone pls design it WITHOUT having to use the tweak unless u guy's have a crack for it ? (sounds noob sry =S)