Subaru’s STi brought a whole slew of new tech to the table when it first came out, including a differential controller dubbed “DCCD”. With fancy buttons and knobs, one could adjust the amount of center differential lock they wanted, be that a 50/50 split all the way to 35/65, with an automatic choice actively controlling between those two. However, being an OEM application, it wasn’t very up to snuff with real motorsport applications.
Jeff Reid took this into his own hands and made the DCCD pro, an active diff controller that essentially takes an entire calculus book, a bit of physics, and marries them to the 6 speed’s controller. Taking inputs from throttle, braking, and even lateral g’s (thanks to the supplied g sensor) it transforms into a “smart” diff that allows for more oversteer, more left foot braking, and of course more awesome. With a starting price of $125, it’s a far cry from the cost of buying professional rally units and worth its weight in gold in the handling department. DCCDpro.com