1. nobody will answer your questions through email. if you want help, atleast take the time to check back here, as answering through email takes longer.
2. 18" rims on a tiburon will look stupid, and will be destroyed if you tap a pebble, cause your tire MIGHT be as thick as a rubber band. not to mention they will be super heavy and rob you of a lot of power. extra rotational mass will KILL your acceleration. go for a set of 16s. they are light, look pretty good in our small wheel wells, and are more durable.
3. here ya go....you even posted there.
http://hyundaiperformance.com/forums...1&search=80285