10 pairs of cars separated at birth
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Subaru BRZ / Scion FR-S
The most hyped twins today are the new sport coupes built through the collaboration of Subaru and Toyota. You have to study these cars closely to find anything but a name badge to tell them apart: Their front bumper covers are slightly different, and the Scion's got a little badge that says "86" on the front fenders (a nod to the AE86 rear-drive, ultrafun Toyota Corolla coupe of 1983 to 1987). Inside, the auxiliary gauges are slightly different sizes, but the cars share a unique flatter version of Subaru's 2.0-liter flat-four engine that makes 200 hp with Toyota's fuel-injection system.
Actually, this one is a three-part rebadging job. Overseas, the Scion is called the Toyota GT-86, or just Toyota 86.
Pontiac Vibe / Toyota Matrix
The sheet metal on these two tall compact wagons is slightly different, as are the plastic fascias, but the biggest difference is that these mostly identical cars were built at different factories. The Pontiac was built in Fremont, Calif., from 2003 until GM announced it was killing Pontiac and stopped Vibe production in 2009. Matrix production continues at Toyota's Ontario, Canada, plant. Additionally, for a couple of years Toyota sold the Vibe in Japan and called it the Voltz.