i meant no disrespect, but i can't just take your word for it. looking at images on google and in-game. the front and rear wing are different. from wikipedia i found that ir18 has some changes to floor too. the rear tyre "blocker" (idk what is called) is very different too. yet they have exactly same physics values ? edit : the sidepod design is completely different too https://www.racecar-engineering.com/wp-content/gallery/dallara-ir12-indianapolis-test/zupirl2.jpg https://content.api.news/v3/images/bin/ae42fdefde13f1ed001bea2004809fc7 Take a look for yourself, i think u are understating the difference quite a bit.