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Chris Harris hits the track in the Porsche 911 GT3 RS

One of the wonderful things about Chris Harris on Cars is the enthusiasm that the host brings to the screen. Granted, it would be hard not to enjoy a day driving around in a supercar that you don't own. Still, Harris brings a sense that he knows how rare these opportunities are and relishes them. In his latest look at the two sides of the latest Porsche 911 GT3 RS, you can tell this guy is having a lot of fun. The GT3 RS is a 500-horsepower, track-focused weapon, but it's expected to drive to and away from the circuit after a day of laps. Therefore, Harris decides to evaluate the attributes of this Porsche in both environments. On the road, he sweeps an orange example over some beautifully, undulating German backroads but keeps things rather tidy. However, in the latter half of the video, he arrives at the Weissach test track for a go in a purple RS. There, he really lets the rear hang out.

Ruf RGT 4.2 offers 518 hp of naturally aspirated power

Ruf has a reputation for building some fast interpretations of the Porsche 911, and the company's latest RGT 4.2 at the Geneva Motor Show provides an interesting point of comparison compared to the new GT3 RS that's debuting there. In terms of pure power, the Ruf wins out. The company crafts a flat six with 4.2-liters of displacement making 518 horsepower and 369 pound-feet of torque with a top speed of 200 miles per hour. In contrast, the latest GT3 RS gets 500 ponies and 338 lb-ft of twist from its direct-injected 4.0-liter mill. Depending on your desires, the RGT 4.2 might have the preferred gearbox too with its six-speed manual versus the Porsche's PDK. Styling is also going to come down to personal tastes between these two. The RGT 4.2 has an almost old-school racing look with its bolted-on fender flares, five-spoke wheels, thick carbon fiber rear wing and lower front air dam. Inside, there's also an integrated roll cage. The RS, on the contrary, appears thoroughly modern with its big fender intakes at the back, slashes just behind the front wheels, CFRP hood and magnesium roof. Check out Ruf's naturally aspirated monster on the Geneva show floor in the gallery, above. The RGT 4.2 maintains a long tradition of Ruf supercars with its outrageous driving performance. Unveiled in 2000, the first RGT was characterised by its powerful, torquey normally-aspirated flat-six engine. With a significantly reduced all-up weight and sports-oriented suspension system, the RGT was an extremely impressive driving machine.Now, in 2015, the RGT remains true its original concept, though its external appearance is clearly more athletic. The wheel arches are more bulbous and the front facade presents huge round air intakes for more effective cooling. The chassis is reinforced by RUF's hallmark Integrated Roll Cage (IRC). Propulsion is provided by its virile 4.2-litre six-cylinder, normally-aspirated engine, developing 525bhp and 500Nm of torque, featuring dry sump lubrication with external oil tank. A proper driving machine for sure POWER 525 PS / 386 kW @ 8.370/min TORQUE 500 Nm @ 5.820/min DISPLACEMENT 4178ccm TRANSMISSION 6-speed manual gearbox TOP SPEED 322 km/h FUEL CONSUMPTION urban 19,8 l/100km non-urban 9,8l/100km combined 13,6 l/100km CO2 emissions 317g/km Effizienzklasse G Related Video:

One Lap of America, with three times the madness

Instead of celebrating last weekend face down in a sombrero full of tequila-spiked OJ and a few lime wedges, 71 racing teams with one set of tires each and no support crews began Cinco De Mayo — and this year's 35th running of the One Lap of America — by hitting the wet skid pad at Tire Rack's headquarters in South Bend, Ind. There were Porsches, Vettes, Camaros and BMWs galore. There was a Miata, a vintage NSX, a Honda S2000 and even an old VW Rabbit. There were GTIs, the odd Evo and, oh yeah, six Toyotas, a couple of Vipers and a couple of GTRs. When the skidding stopped, a 2011 BMW 1M emerged triumphant and led the pack out into the heartland, where it will spend 5,000 miles this week hitting road courses, dragstrips and time trials at tracks as far west as Denver, as south as Fort Worth and then New Orleans. From there, it will barrel north through Mississippi, Alabama, Nashville, Kentucky and back home again to Tire Rack in Indiana. Twenty events, eight venues, with a three-hour window for each event. It's a nonstop, no-sleep, one-week road trip comprising 150-ish friends and brothers, partiers and pro racing drivers, spouses and other family-member combo packs. Some will never speak to each other again, some might end up divorced, some might get married. All of them are nuts. I know this because I made three laps. Three laps I will never forget.LAP ONE: 1984 Vehicle: 1984 Dodge Van Team #0: Jean Lindamood (Jennings), Walker Evans, Parnelli Jones I was present for the inaugural 1984 One Lap of America because I worked at Car and Driver back then and so did Brock Yates. He was the guy who came up with the clandestine, illegal, unsanctioned Cannonball Baker Sea-to-Shining-Sea Memorial Trophy Dash from Connecticut to Redondo Beach, Calif. It ran five times in the 1970s, with Yates joining Dan Gurney in a Ferrari Daytona for the second run. They won, Gurney insisting that "at no time did we exceed 175 miles per hour." One Lap was born of Cannonball nostalgia (read: Brock was bored), and I was beyond game for it. After securing a van from Dodge and two giant decals for the van sides, along with $5,000 in sponsorship from local Detroit Stroh's Brewery, I coaxed my friend, nine-time Baja 1000 winner Walker Evans, into running One Lap by suggesting he didn't have a hair on his ass if he refused. Then I suggested that if he didn't get his best friend and longtime road trip buddy, Parnelli Jones, to go with us, I would actually have to drive the van, too.