STaSIS may not yet be a household name, but with more cars like these, that may change. Based on the Audi S5, the Signature Series S5 comes in two levels of trim called Touring or Challenge Edition. The Touring Edition comes with Ohlins SL dampers, 20 inch STaSIS Monolite RS 147 forged wheels and a T-304 stainless steel exhaust while the Challenge Edition features a 370-mm Alcon Mono6 front brake upgrade, Torsen center differential, anti-roll bar package and an ECU upgrade estimated at an (...)

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