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STI versions of the Impreza, Forester and the Legacy have been marketed as limited edition vehicles in certain markets. STI also designs upgraded parts, mostly suspension related, for use on other Subaru vehicles. The Subaru Impreza WRX and the Subaru Legacy B4 both come in high performance STI editions (formerly capitalized "STi" before the 2006 model year), designed by STI. The STI offers many advantages over the WRX, such as a six-speed manual transmission with a helical (Suretrac in '04 models) limited slip front differential, driver controlled center differential(DCCD), IHI VF39 turbocharger (VF43 in 2007, VF48 from 2008 on), BBS lightweight alloy wheels, a mechanical rear limited slip differential and Brembo brakes. The WRX STI has Recaro style bucket seats and a MOMO steering wheel. The WRX STI was the first and so far only STI vehicle made available to North American consumers. While the WRX was first released for the North American market in 2001 for the 2002 model year, the limited production Impreza WRX STI sedan with 300 hp and 210 foot pounds of torque did not hit the market until 2004, with a base price tag between $35,000-$40,000. STI also released Legacies kitted out in full STI trim. These are rare and sought after by Subaru enthusiasts. They were only released new in Japan (JDM) and New Zealand (NZDM). In 2016 an STI kit was built for the redesigned Crosstrek models which included STI branded wheels, hatchback spoiler, and shift knobs for both automatic and manual variants. Some Subaru enthusiasts have requested that the manufacturer install the STI engine in the BRZ to provide extra power, but there is concern that a more powerful BRZ would compete directly with the WRX. Drawings of a BRZ STI exist online and concepts have been shown at auto shows, but Subaru has yet to release an official statement. However, there is speculation that the next generation BRZ will be ready by the summer of 2018, with a naturally aspirated engine.