Crown Automotive 3242393k Rocker Arm Kit on 2040-parts.com

One Lap of the Web: Senna's sweet go-kart

-- Gran Turismo has always included some, uh, unique car choices for its video games. (Sure, the Patent-Motorwagen is significant, but hot-lapping the 1-hp horseless carriage in "Gran Turismo 4" wasn't exactly riveting, unless you used cheats.) So that's why Ayrton Senna's go-kart from the 1978 World Karting Championship should be interesting -- it's nowhere near as fast as his Lotus 97T, but it shows that "Gran Turismo" wasn't kidding when developers said they wanted fans to chart the entirety of Senna's life. Plus, if you make it go 352 mph you can finally stick it to Prost.

2012 Mercedes-Benz SLS AMG Roadster video hits the Web

Last week we showed you fresh photos of the 2012 Mercedes-Benz SLS AMG Roadster. In this morning's edition of car porn, we give you a video of the two-door convertible that shows interior details and an action shot of the soft top dropping while the car moves along at 31 mph. That's all great but, with 563 hp under the hood, we just want to see this thing go fast.

Tis the season

It's time to once again show the world your giving spirit. The annual Championship Auto Racing Auxiliary (CARA) auction of racing items—cool stuff gathered during the 2012 racing season—is underway. The CARA auction is run in association with Autoweek and can be found here, at autoweek.com.