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Submit your questions for Autoblog Podcast #325 LIVE!

We're set to record Autoblog Podcast #325 tonight, and you can drop us your questions and comments via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #325
Twin-turbo Cadillac CTS coming

Mercedes-AMG to phase out 5.5-liter V8 after next year [UPDATE]

UPDATE: A previous version of this story indicated that AMG's 6.0-liter twin-turbo V12 was still mated to a five-speed automatic transmission, however the latest models (including the S65 AMG sedan and coupe, SL65 roadster and G65 sport-ute are equipped with the newer seven-speed unit. Mercedes also reached out to point out that the 5.5-liter engine will be phased out gradually, not overnight. There's a lot to love about AMG's 5.5-liter twin-turbo V8. It produces as much as 577 horsepower and 590 pound-feet of torque, and delivers blistering performance to even the heaviest of vehicles. But try not to get too attached, because like its 6.2-liter, naturally aspirated predecessor, it's not long for this world. The latest word comes from Autocar, which reports that Mercedes will release the last applications for the 5.5 biturbo within these next two calendar years in the new GLE63 AMG and upcoming S63 AMG convertible. After that, even though it was only introduced in 2011, it will be phased out. Fortunately Affalterbach has a worthwhile successor already in place in the 4.0-liter twin-turbo V8 from the Mercedes-AMG GT. The smaller powerplant, already in store for the new C63, is already producing 503 hp and 479 lb-ft in S spec. That's still shy of the larger unit's output, but where the 5.5 is nearing the end of its production cycle, the 4.0 is just starting out. Of course the 4.0-liter biturbo isn't the only engine AMG is making these days. Smaller models (based on the front-drive platform) employ the 45-designation, high-output 2.0-liter turbo four. Models at the very top of the lineup, however, use a 6.0-liter twin-turbo V12 that may be a dinosaur, but with 621 hp and 738 lb-ft of torque on tap, still can't be beat.

Mercedes-AMG GT3 racing towards Geneva debut

So far, we've only seen the fundamental road-going coupe version of the new Mercedes-AMG GT, but like the Porsche 911 it targets, you can bet there will be more derivatives to follow. And this is our first glimpse at the first of them. At the Geneva Motor Show next month, Mercedes will showcase the GT3-spec racing version of the AMG GT. The German automaker didn't tell us much more in making the announcement, but did release a pair of cropped teaser sketches showing the sports car with all manner of racing appendages, including what looks like a massive rear wing. Once ready for action, the new Mercedes-AMG GT3 will replace the previous SLS AMG GT3 that won the Nurburgring 24-hour race a couple of years back. But with every automaker and its sister company getting in on the GT3 racing action these days, it'll face some stiff competition on the track. The new Mercedes-AMG GT3 February 12, 2015 Neatly coinciding with the upcoming market launch of the road-going version of the Mercedes-AMG GT, the next stage of the vehicle's evolution is already here: the sports car and performance brand of Mercedes-Benz is presenting a new customer sport racing car that complies with FIA GT3 race regulations in the form of the new Mercedes-AMG GT3. With this, the second customer sport car to be developed by Mercedes-AMG, the Affalterbach company is seeking to build on the success of the SLS AMG GT3 and further expand the customer sport programme first started in 2010. The superb racetrack performance of the road-going GT forms the ideal basis on which to model the new Mercedes-AMG GT3, which is due to make its debut appearance at the Geneva Motor Show. Featured Gallery Mercedes-AMG GT3: teasers Geneva Motor Show Mercedes-Benz Coupe Racing Vehicles mercedes-amg 2015 Geneva Motor Show rendering mercedes-amg gt sketch mercedes-amg gt3