The body kit on the Speedhunters Scion Tuner Challenge is their own KM4SH kit sold through Speedhunters. Its fairly priced for a widebody kit.
The wheels they used are custom Rotiform wheels. Check them out
here They are NOT CHEAP. I believe they start around $1000 PER WHEEL. That style of wheel is usually called meshies or a mesh style wheel.
I am sure there are other wheels that look similar (but are cheaper) and you can start by looking
here .
The louvers you can buy
here. Nigel JMD is a good brand to buy from but if the price scares you, check around. Few people have the louvers on their car but i am sure you can find them elsewhere.