It looks like they took inspiration from the Mugen body kit, which is cool. The odd proportions of Hot Wheels used to bother me, but they've grown on me as I've gotten older. It seems like Mattel is content to squish and squeeze the castings in order to make a cooler toy, which is fun in its own right. I guess if you want 100% scale accuracy, go for a Tomica! I think they have a nice Ballade Sports in their super-detailed "Tomica Vintage" lineup.
1980 Toyota Celica
1984 Porsche 911
1988 Mazda RX-7
Ex-JNCs: 1980 Datsun 510, 1979 Mazda RX-7, 1986 Mazda RX-7, 1992 Mazda Miata