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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.

Final Lexus IS F rolls off assembly line in Japan, bound for US

We knew this day would come, but it's nonetheless a bit of a sad one for Lexus enthusiasts as the very last example of the IS F has rolled off the assembly line in Tahara, Japan. Decked out in its trademark bright blue, the final IS F is destined for a customer right here in the United States.
Far from just another now-defunct model in an endless succession, the IS F marked the first time that Lexus did a proper performance model, debuting in production guise at the 2007 Detroit Auto Show alongside the LFA concept long before the latter entered production and took the idea of the high-performance Lexus even further. The IS F may not have sold in huge numbers, but it definitely marked a milestone for Toyota's luxury division.
Don't cry too much, however, as the new RC F that effectively takes its place packs an even mightier punch. While both are powered by essentially the same 5.0-liter V8 engine mated to an eight-speed automatic driving the rear wheels, the outgoing sedan's 416 horsepower and 371 pound-feet of torque is easily outgunned by the new coupe's 450 hp and 383 lb-ft.

Lexus LC 500 gets customized at SEMA before it even goes on sale

We still have to wait until next year for Lexus to start delivering the gorgeous new LC 500 to dealer showrooms, but that little fact didn't stop Lexus from letting people modify it for SEMA. The first LC coupe to get the custom treatment is this bright yellow example modified by Gordon Ting and Beyond Marketing. Prospective LC 500 buyers who want to modify their rides won't have to wait long do start adding these parts to their cars. Because Lexus let these companies develop parts this far in advance, the parts should be available around the same time as the car. On the outside, the LC 500 gets a new Artisan Spirit body kit that consists of a front diffuser, fender flares, side skirts, rear diffuser and rear spoiler. The car also has a lower stance thanks to a kit developed by KW Suspension. It features adjustable springs for ride height, plus a hydraulic lift system to keep the custom body work from scraping. The Lexus rolls on HRE P101 wheels that are stopped by Brembo brakes. The other highlight of this custom Lexus is under the hood. The LC 500 comes with a 471-horsepower 5.0-liter V8 that's also found in the RC F and GS F. However, the engine development team at Hard Media, Inc. and D SPORT Magazine had the engine rebuilt with CP pistons and Carrillo connecting rods, and it was given new cylinder sleeves from LA Sleeves to increase bore-size. The end result is a 5.6-liter engine making 525 horsepower. According to Lexus, 525 horsepower is far from the limit of this engine, saying that its capabilities could be, and in fact "have been more than doubled." If anyone at Lexus is reading this, we don't doubt the claim, but we'd also be more than happy to see this capability proven. Perhaps at next year's SEMA show? Related Video: Featured Gallery Customized Lexus LC 500: SEMA 2016 View 9 Photos Image Credit: Live photos copyright 2016 Drew Phillips / Autoblog Aftermarket SEMA Show Lexus Coupe Luxury lexus lc 500 SEMA 2016