the IRL also has 3 diffrent engine manufactures Chevy, Honda, and Toyota. I belive the engines are beefed up stock engines( if that makes since)
The IRL also has 3 chassis manufactures, Dallara, Panoz G-Force and Falcon. The all are new desings this year and Falcon is a brand new chassis. They all look simialr from a distance but once you get closer to them you can tell the diffrence.
last year it was fairly cheap to run a car(if 1million is cheap) this year its going to cost more since each team has to buy all new cars and all new engines so for a small team will easily spend 1 maybe 2 million and a big team will spend easily 4-5 million. Its still cheaper than CUP.