I wish I'd known about this before I went through ITS for my EX500. I bought it without a title and they charged about $150 or so in 2009 for bikes over 15 years old. I'm not sure what Indiana's laws are on riding on out-of-state plates, but I rode on the Maine plates until the expired in 2010 and was never hassled.
1998 Triumph Daytona
2007 Suzuki S50