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A performance package is a set of functional enhancements to the driveline of a vehicle, sold and priced as a unit. This package may contain one or more of the following enhancements *Greater engine torque *Greater engine power *Lower ratio gears to enhance low end performance, now rare due to requirements for model specific emissions (smog control) and mileage (CAFE) certification *A greater number of speeds in the gearbox, manual or automatic *Clutchless manual transmission, usually including steering wheel ''paddle shifter'' controls *Turbocharger or supercharger, perhaps with intercooling *Cold air induction *Dual exhaust system *Special low back pressure mufflers, often with a distinctive (and sometimes quite loud) sound *Special cosmetic badging, hood scoop, or grille color, not usually related to performance but making the presence of the package obvious ==See also== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Performance package」の詳細全文を読む スポンサード リンク
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