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Why is there a huge bulge in 2021 Lexus IS 300 AWD's driver footwell? We explain

After an initial turn a few weeks ago for the 2021 Lexus IS first drive review, the revised luxury sedan has returned to the Autoblog garage for a second look. This middle-of-the-road IS 300 AWD pairs a 260-horsepower V6 with a six-speed automatic transmission and four driven wheels, and frankly it's the least interesting way to spec out the redesigned sedan. While there are cars in this segment designed to get a performance boost from their all-wheel-drive systems even in dry conditions, the IS isn't one of them. Adding insult to injury, you get stuck with a cramped driver-side footwell care of the engineering shenanigans that went into making this system possible.  While we've mentioned this particular compromise before, we rarely touch on the reasons why it exists in the first place. The fundamentals are fairly obvious; the standard IS utilizes a longitudinal, rear-wheel-drive powertrain. As is typical with this configuration, the transmission sits in a tunnel beneath the center console. This arrangement works just fine, provided you don't need to power the front wheels.  To do so in a traditional car like the IS requires a literal end-around maneuver involving the engine and transmission, which we've diagrammed for you below care of MSPaint. This is a bit simplified for the sake of this write-up, and it should be noted that this is not the only way to implement AWD in an inherently RWD platform, but it illustrates how the power for the front axle (red) and rear axle (blue) flows from the transmission to the drive wheels. To get juice flowing to the front axle, Lexus had to add a parallel output shaft, exiting the transmission from the front with enough clearance for the bell housing and engine, which sits between the transmission and the front differential. This requires quite a bit of lateral reach, meaning the housing has to extend much farther out than usual to accommodate it (yellow arrow). As a result, the all-wheel-drive transmission looks a lot like a sci-fi gun with a chunky drum magazine hanging off the side of it. The hump (above right) in the footwell is there to clear this protrusion. This basic configuration isn't unique to Lexus. In fact, if you look at a BMW xDrive cutaway, it's similar. So, why no "hump" in other cars? There are multiple factors, but to boil it down to what is most relevant, it's a combination of the resulting shape of the Lexus transmission housing and the size of the IS chassis.

2015 Lexus NX starts at $34,480*

Lexus has announced pricing for the 2015 NX crossover lineup, which goes on sale next month.
The NX 200t starts at $34,480, and the all-wheel-drive model adds a $1,400 premium to lift the sticker to $35,880 (*destination charges of $925 are not included in the prices). The 200t uses a 2.0-liter four-cylinder engine making 235 horsepower, and it's Lexus' first-ever gasoline-fed turbo.
The hybrid version, the 300h, starts at $39,720, and all-wheel drive tacks on $1,590 for a price of $41,310. The hybrid teams a 2.5-liter four-cylinder with an electric motor to generate 194 hp. Though power dips, Lexus anticipates this version will get a combined 33 miles per gallon with front-wheel drive when the EPA ratings are announced - a considerable leap when compared with the combined 24-mpg estimate for the turbo model.

Production Lexus NX small CUV headed for Geneva

Just five months ago, our spy photographers caught what appeared to be a mule for the forthcoming Lexus NX crossover with the body of a CT 200h for disguise. Then the LF-NX Concept CUV debuted at the Frankfurt Motor Show (it showed up at the Tokyo Motor Show as well) with a massive spindle grille and an extreme version of Lexus' sharp-edged new styling language on full display. Now Auto Express reports that a production version of the LF-NX concept will grace the Geneva Motor Show next March and go on sale next summer. If the names that Lexus trademarked a while back are any indication, it'll come in two trims, NX 200t and NX 300h.
Concept vehicles often look outrageously bold, with more extroverted styling than what eventually makes it into the production version. But Lexus reportedly will leave much of the LF-NX concept's styling alone for the production version, citing its customers' changing tastes.
"What we're finding is that these days customers want to be more expressive, so a lot of the concept's inherent design will come out in the finished car," says Paul Van der Burgh, Lexus' European director. "Why would you want something that looked like everything else in the segment?"