Among the most desired special editions of the Porsche 911, option code M491, “Tublo Look” is at the top of the list for most aficionados. The Bonhams Quail Lodge auction in August will offer a 1987 Turbo Look Carrera, with a “Slant Nose” front end design, believed to have been installed for the original owner. It’s all Porsche steel, not a fiberglass knock-off, with a pre-sale-estimate of $80,000 — $120,000, with no reserve.