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i found two answers the first is
Si is just the trim level. It is code for what options or extras are included. The civic si currently includes: 2.0-liter, DOHC i-VTEC® engine• 197 hp @ 7800 rpm• 139 lb.-ft. of torque @ 6100 rpm• Helical limited-slip differential• Drive-by-Wire Throttle System™• Close-ratio 6-speed manual transmission• MacPherson strut front suspension• Double wishbone independent rear suspension• 17" alloy wheels• Rear wing spoiler• Daytime Running Lights (DRL)• Anti-lock braking system (ABS)• Electronic Brake Distribution (EBD)• Dual-stage, dual-threshold front airbags (SRS)• Front side airbags with passenger-side Occupant Position Detection System (OPDS)• Side curtain airbags• Active head restraints• Security system with remote entry and trunk opener• Power windows, door locks and mirrors• Tilt and telescopic steering column• Driver's seat with manual height adjustment• Deep, bolstered front sport seats with red stitching• 60/40 split fold-down rear seat• Rear-seat beverage holders• Two-tier instrument panel• Tachometer with rev-limit indicator• Red backlit gauges• 12-volt power outlets (2)• Exterior temperature indicator• 350-watt AM/FM/XM Ready®â€*/CD premium audio system with 7 speakers, including subwoofer• Exclusive Si badging and trim• Available Michelin® Pilot® Exalto® PE2™ summer tires (P215/45 R17 91W)
and the second is
Not just a 'trim level'. SI stands for: Sports Injection.
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