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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 exec says he still fields complaints about the spindle grille

When Lexus debuted its spindle grille on the GS sedan and trademarked the design back in 2012, it was a sure sign the look was here to stay. It started making its way through the lineup, and now five model years later, it's on all Lexus vehicles. The one thing everyone can all agree on is, it's bold. And Lexus has doubled down on the design with the LF-1 Limitless Concept on display at the Detroit Auto Show. Some people surely think nothing of the grille. Others have equated it to a cartoon character, a beard trimmer, or a baleen whale scooping up krill. In one harsh, perhaps apocryphal criticism, a design professor is said to have likened the spindle to the mouth of the titular hunter-alien in the "Predator" movies. In a much more admiring spacefaring comparison, our Antti Kautonen said the grille of the LF-1 Limited Concept mimics a "Star Wars" ship's shift into hyperspace. That's a fitting analogy for the stunning and futuristic LF-1, which might be the single most dramatically styled vehicle at the North American International Auto Show. A couple of years ago, Toyota chief designer — and head of Lexus — Tokuo Fukuichi defended the spindle in a Reuters interview, saying "sexy" was a goal of the design, and dismissing complaints by saying, "Even polarizing designs, you get used to them after a while." That defense was "a while" — three years — after the new look caused an uproar at a 2012 Toyota stockholders' meeting, where some shareholders complained. Now it has been a while longer, and a Lexus executive says the spindle grille has continued to divide Lexus customers. Jeff Bracken, Lexus group vice president and general manager, told Carbuzz on the sidelines of the Detroit show last week that longtime repeat customers still can't get their heads around whatever it is the car seems to be getting its mouth around. "I'll be very transparent. It's our signature grille. Some of our models have a more expressive signature grille than others. The folks that look at it as somewhat polarizing would be, for the most part, the folks that have been with us since the beginning. In fact I'll take phone calls from some of these owners and will literally spend 45 minutes to an hour on the phone with me just expressing how disappointed they are," Bracken said. Bracken has actually been saying almost the exact same things about the grille for years — both to upset customers and to automotive journalists — for example, to Forbes in 2014.

The Lexus Sriracha IS is the hottest Lexus ever

For this year's Los Angeles auto show, Lexus created its hottest IS ever: the Sriracha IS. And the company did so by putting Sriracha sauce in everything! It's in the paint, the steering wheel, and even in the trunk! Check out the video if you don't believe us. Ok, so Lexus didn't really put Sriracha in everything. In reality, the company partnered with Huy Fong Foods to produce this one-off car, and turned to West Coast Customs to execute it. It features a custom paint job designed to emulate the look of Sriracha sauce, and green accents on the grille, mirrors, brake calipers, and exhaust tips are a call back to the food company's sauce bottles. View 13 Photos Inside, West Coast Customs created some clever and surprisingly subtle changes. The climate controls only show increasing heat levels, and the seat heater buttons are bright red with little flames above the seat icons. The drive selector trades sport mode for "Sriracha" mode. The seats get red and green inserts along with logos stitched into the seat backs. Other parts of the interior have green contrast stitching, too. The steering wheel is a particularly unique piece. West Coast Customs found a liquid that looks similar to sriracha, put it a resin container and shaped it to fit the steering wheel, so now it looks like there's sriracha in the steering wheel. It also has a warning sticker for "hot handling." And lest you think there isn't any real Sriracha anywhere in the car, you'll find 43 bottles of the stuff in the trunk, and the key fob dispenses some as well. As for how Lexus tops this, perhaps they could make a habanero or ghost pepper car. Or maybe they could show us a real IS F successor. We think another V8 Lexus would come across as pretty hot. Related Video: