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BMW M4 vs. Lexus RC F in Head 2 Head sports coupe showdown

It's the showdown everyone's been looking forward to, the East versus West grudge match of the year. We're talking, of course, about the BMW M4 versus the Lexus RC F.
Although BMW uses a twin-turbo straight-six and the Lexus uses a free-breathing V8, the two are pretty closely matched on paper: a luxury coupe with over 400 horsepower channeled to the rear wheels.
The BMW has been doing these cars for longer, and the M4 boasts a higher power-to-weight ratio. But then the RC F has more power - and without forced induction to break up the rev range. So which is the better luxury muscle coupe? Watch the latest episode of Motor Trend Head 2 Head to find out.

2014 Dinan S1 BMW M5

The last time the Dinan name graced the pages of Autoblog, Michael Harley was waxing poetic about the S3-R BMW 1M Coupe, a car that still stands in his ranks as one of the best cars he's ever driven. And that wasn't just because it was, you know, amazing. It's because as far as tuners go, Dinan produces some seriously well-executed products. Harley said of the 1M, for example, "It was so fully formed and well-rounded that it felt like BMW itself had made it."
Eager to sample some of these wholly wonderful wares, I cleared a few hours in my Monterey Car Week schedule and booked a date with the S1 M5 you see here - the (current) daily driver of Mr. Steve Dinan, himself. But unlike the S3-R 1M the company tuned previously, the donor car in question here is vastly different and, if I'm honest, not as good. See, I adore the stock 1M in a way words cannot express, but the standard-issue M5... good as it is, there are indeed a few flaws.
But after driving the Dinan S1 M5 around the Monterey Peninsula, I can confirm two things. First, Harley's conclusion that Dinan builds products that feel 100 percent BMW-spec is absolutely true. And second, Steve and the gang haven't just created a tuned M5, they've built a better one.

BMW X4 hatches its fastback shape in Shanghai

The day has finally come for BMW to pull the covers off its X4 Concept at the Shanghai Motor Show. The machine brings few surprises - we've already seen an official image gallery from the German automaker, so its exterior shape was well known - but at least now we get to see it with our own eyes, and with the lenses of our very own cameras.
You can clearly see the fastback roofline in our high-res image gallery above, along with the jacked-up stance that allows BMW to call this machine a Sports Activity Vehicle, which basically means "Crossover" to our friends in Munich. We've seen similar vehicle shapes before, most notably in the form of the BMW X6, but also as far back as the 1980s from the likes of AMC.
We fully expect the transition from concept to production to be pretty seamless, so what we see here is, for the most part, what we'll see on the showroom floor in 2014. Feel free to peruse the press release below, but first, be sure to browse through our live images from Shanghai and let us know what you think.