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BMW M3 and M4 CSL not in the cards

We aren't sure whether to file this one under "good news" or "bad news." BMW confirmed to Top Gear that there "are no plans" for lightweight versions of the new M3 and M4, in the same vein as the E46 M3 CSL (despite rumors to the contrary). The reason?
"There wasn't a CSL on the previous generation, and the way we look at it is like this: the CSL was great because it had this real focus on lightweight engineering. But we've already done that with these new cars. We've made them as light as possible - they come in under 1500 kilograms (3,306 pounds), which for a car like this is incredible," said Matt Collins, BMW's product manager for small to medium cars.
Now, as much as we love the idea of a hardcore version of any car, we appreciate BMW's point of view that the newest Ms are already as light and tough as they need to be. Collins elaborated, saying, "Rather than doing a halfway house to begin with and then rolling out a CSL, we thought we'd make the 'real' car as light as we possibly could. So we've no plans whatsoever to make a lighter, harder version just yet."

BMW M3 and M4 will rock 430 hp from twin-turbo six with standard manual [w/video]

We're not sure which spec we're most intrigued by for the new BMW M3 and M4: the twin-turbo six-cylinder with 430 horsepower and "far beyond" 369 pound-feet of torque, the 3,300-pound curb weight or the standard six-speed manual transmission with automatic throttle blipping on downshifts. That engine is fitted with both Valvetronic and Double-Vanos, twin-wire arc-spray coating in the cylinders instead of liners to save weight, a track-ready cooling system with additional radiators, a forged crankshaft, dry-sump lubrication and a magnesium oil sump. BMW says its "high revving concept" has a redline beyond 7,500 rpm.
In the M4, it will be pulling a coupe with "a weight of just under 1,500 kilograms," which is 3,300 pounds to you and me. That number is said to include no driver and 90 percent fuel, but we're still waiting on the exact number and specs. BMW says it's "around 80 kilograms lighter than a comparably equipped predecessor model," putting the power-to-weight ratio at something like 7.68 pounds per horsepower at the same time as it helps reduce fuel consumption by 25 percent. The use of carbon fiber reinforced plastics (CFRP) for the roof, drive shaft (with no center bearing), trunk and front strut brace, and forged aluminum for suspension components, have aided in the weight loss. This time around, the sedan - the M3 - will also get a CFRP roof.
The default option will be a six-speed manual.

BMW M6 amped up for track duty by Risden

Risden Engineering is a bit of an unknown, if we're being completely honest - we have yet to report on the company to date, and its corporate website is really an information desert save for the name and a few email addresses. Even the press release that we requested from Risden's contact person is short and vague. That's all pretty much okay with us as long as the shadowy tuners, you know, make good on this sweet-looking BMW M6 racecar thing.
Dubbed the Risden 6R, we're told that the M6 modification will result in a vehicle that is more adept at track work, while still being street-legal. In terms of specifics, we read that a full aero kit will be involved, with one fixed and one retractable rear wing (hard to miss). There are obviously new wheels, and the company has also added a fully adjustable suspension, a four-point roll bar and a new braking system - all while reducing curb weight overall.
Apparently more details are to follow after the 6R's official release in the first quarter of 2013. We wait with bated breath.