I did. That's why I gave you the N24 as an example. And also why I said "rarely", not "never". And, just like Le Mans, a car in a lower class still gets overall rankings and can, if it manages it, take an overall win or podium. Like Le Mans in 2017. So they do race against each other, as well as in classes. Which rather makes me wonder why you keep bringing up real life GT3/GT4. GTS has fictional Gr.3 cars that manufacturers don't have in real life in order to fill out the Manufacturer Series. VW doesn't have a GT3 car, so PD gave it a Gr.3 car based on the Volkswagen New Beetle (for some reason). As GT3 (and Gr.3) is essentially a silhouette series that relies on BOP to equalise the cars, there's no particular reason why a GT3 Beetle couldn't exist and couldn't beat a GT3 Porsche - it's just a spaceframe with a 600hp engine, 6-speed homologated gearbox and mandated rear wheel drive, wearing a Beetle suit. It doesn't, but then aside from showy one-offs like the I.D. R, Volkswagen isn't doing much expensive racing right now, I'd guess because it owes a lot of money to the USA. The case for GT4 is less clear, as BOP only addresses single-lap pace and not tyre wear. There is a reason that no series I'm aware of at first thought allows front, rear and four-wheel drive cars to compete in the same category. If it's just brand snobbery, allow me to point you to WTCC, where the Chevrolet Cruze won four successive championships, beating a Ford Focus, SEAT Leon and Honda Civic, and where Lada - Lada - won three races in 2016. Race cars aren't road cars. There's no reason why Brand X can't beat Brand Y, even if Brand X sucks and Brand Y is awesome, when the cars are homologated and equalised by BOP.