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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.

Lexus IS F avoids cancellation, priced from $63,350*

Ever since the redesigned Lexus IS hit the scene, we've been wondering about the 416-horsepower IS F model, and now we finally have some answers. For 2014, the IS F carries over with the previous bodystyle, and Lexus gives its sport sedan some small changes to go with a higher starting price of $63,350 (*not including $910 for destination) when it goes on sale in October. Compared to the 2013 model (shown above), the price has risen by $1,600.
For that extra money, buyers will get a couple styling changes like the new carbon fiber decklid spoiler and LED fog lights, as well as some minor interior updates like headrests embossed with the "F" logo, Alcantara trim added to the door panels and center console cover, semi-aniline leather replacing the black leather and black Alcantara seat-inserts added to cars equipped with the red leather seats.
The price hike for the IS F is considerably higher than the rest of the 2014 IS lineup such as the $885 increase for the new IS250 and the $855 drop for the IS350 while pricing for both IS Convertible models (IS250C and IS350C) went up by $100 each. Speaking of price increases, Lexus has also increased its destination charge slightly from $895 up to $910.

Lexus RC F and SI swimsuit model Lisalla Montenegro compare flowing lines

Lexus has been desperate to break out of its decidedly boring image for years. There is no doubt that it has made quality cars, but many of them have lacked for excitement. But with the new RC in 2014, especially the M4-fighting RC F version, it might finally turn some heads.
If the car doesn't turn heads, Lexus can at least be sure that Sports Illustrated swimsuit model Lisalla Montenegro will, in its latest video. Of course, phrases like, "Hair by over 383 pound-feet of torque," and, "Goosebumps by an aggressively tuned exhaust note," don't really mean anything, but most of the people watching the video aren't going to be reading the copy, anyway. Instead, they will either be focused on the attractive woman or the cool car. Maybe both. Scroll down to check out the video.