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One Lap of the Web: Porsche 959s, the Alfa Romeo 4C and the Mercedes-Benz A45 AMG vs. the BMW M135i

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- When initially produced to satisfy FIA homologation requirements in 1986, the Porsche 959 was the world's fastest street-legal production car.

Jaguar XFR-S arrives ahead of LA debut

The Jaguar XFR-S – Jaguar’s most powerful saloon car to date – has leaked out ahead of its debut tonight at the Los Angeles Auto Show. We’re hoping that Jaguar has managed to bestow extra power on the very appealing XFR without wrecking the stuff that makes Jaguar saloons so appealing – the dynamic/ride balance – which, if they have, will make the XFR-S a more appealing bonkers sports saloon than the German offerings. The promise is all there with a new butch front end, a more aggressive body kit, chunks of carbon fibre, a huge rear wing for extra downforce, a new diffuser at the back, stiffer springs, a new rear subframe with stiffer bushes, a tweaked active diff and a tweak of the stability control for more fun.

SEAT Leon Cupra 280: Fans enjoy a simulator drive – or did they? (video)

The SEAT Leon Cupra 280 Extreme Simulator In January the SEAT Leon Cupra and Cupra 280 were revealed as SEAT’s take on the VW Golf GTI, but with things taken to another level. That meant the SC getting 261bhp and the 5-door Cupra 280 a very appealing 276bhp, enough to get the 280 to 62mph (when fitted with the DSG ‘box) in 5.7 seconds – appealingly lively. Not surprisingly, there were plenty of SEAT fans wanting to get up close and personal with the Leon Cupra 280, so SEAT invited a lucky pair to get suitably suited and led them in to an extreme simulator for the virtual drive of their life.