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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.

Optimistic Lexus bumps US sales target higher

Last year Lexus sold 244,166 cars in the US, slotting into third place in the luxury segment behind BMW and Mercedes-Benz. Earlier this year Lexus said its target was 260,000 units in the US (which would still put it behind BMW's and Mercedes' numbers from last year), but Automotive News reports that it has raised its upper outlook to 270,000 cars.
The half-year pace hasn't been enough to make either number, but Lexus is gunning for a 15-percent gain in IS sales behind the arrival of the 2014 model, and this is also the first full year of sales of the new ES and LS. Lexus will most likely end the year in third place in the luxury segment behind BMW and Mercedes again, even if it does sell 270,000 units, but has said its prime directive is "good, steady growth."

Here's why our Lexus NX is uglier than the rest of the world's

Take a good look at the image above. That's the US-market Lexus NX 300h, and it looks, well... distinctive. Although the entire NX crossover sports styling that could certainly be described as controversial, it's the front end of the 'ute that seems to draw most of the ire, befitted as it is with Lexus' so-called spindle grill.
Now, take a look at the pair of images just below. The one on the left is from the States (the same model seen above), while the one on the right comes from Europe. Notice a difference? The lower front fascia of the European Lexus NX dips down much lower than the one from the US, and it looks much more refined because of it.
Why the disparity between the two designs? According to Top Gear Philippines, the reason why the US gets the more pointy proboscis is because of its classification as a light truck. It seems trucks are required to have some sort of concession to the car's approach angle - in other words, a truck should be able to clear an obstacle that a car might hit. Why does Lexus care if the NX is a car or truck? Well, that has to do with how fuel economy is reported, as trucks are given less-stringent requirements for Corporate Average Fuel Economy purposes.