SADOKIST's (eSports Host) E46 BMW M3 GT3 Race Car - Kevin Doubleday © Over the years, I've found that limited slip diffs (LSD's) are some of the least appreciated performance parts you could get (or upgrade) for a car. LSD's make a big difference, though, because they can vastly improve how early you can get back on the power and, therefore, how good your corner exit is. That last bit is very important if you're driving on track and want to get a good lap. You don't have to just take my word for it, though. F1 royalty Sir Jackie Stewart puts an emphasis on the importance of corner exit. When Captain Slow was sent to him to cut 20 seconds off his lap time (Top Gear Season 8 - Episode 5), Sir Jackie told him: "the exit of the corner is FAR more important than the entry of the corner, with regards to smoothness." Sir Jackie Stewart coaching James May in a TVR Tuscan - Top Gear Season 8 Episode 5 You really need to nail the exit. And to get a
Mitsubishi Evo X GSR at Atlantic Motorsport Park - Kevin Doubleday © If you live in Canada or the US, you'll find that plenty of people hold sacred the terms '4x4' and '4WD' to describe a 'true 4x4', where you have a butch transfer case with a low speed, perhaps a body on frame chassis, and ideally a solid axle or two. I'm not sure how that translates to the rest of the world. My extensive research into the motoring industry in Europe (which exclusively consists of watching Top Gear and The Grand Tour...) concluded that most people across the pond simply refer to any vehicle that is capable of sending any power to all four wheels as a 4WD vehicle, further muddying the waters. Where I grew up, 4x4 was more or less synonymous with 'Jeep' so that's not much help either. However, despite all various systems attempting to do the same sort of thing - distribute power between all four wheels instead of two - not all systems are created equal,