I presume this is the first 2012 Civic Si which has been tuned to produce such high hp. Here's the modification list, tuned by none other than Bisimoto:
Powertrain Modifications:
Bisimoto built 2.4L K24Z7 engine
Bisimoto steel rods, turbo kit, intake gasket, injectors, and web level 2.4 camshafts
Arias forged pistons
AEM Series 2 EMS, and smart coils
MSD coil wires
NGK Iridium spark plugs
Torco Oils
Turbonetics 72mm turbocharger, blow-off, wastegate and intercooler
Golden Eagle sleeved block, and intake manifold
Griffin Radiator
Supertech valvetrain
Vibrant Vanjen clamps and stainless hardware
Holley billet fuel pump
ARP head, main, and wheel studs
K-Tuned alternator relocation, pulley and water neck kits
Portflow custom headwork
VP Racing E85R fuel
Kinsler fuel filters
ATI Engine Damper
Chassis/Suspension Modifications:
Steen roll cage
Eibach coil suspension and sway bar
Eins Gramm 18x8 aluminum wheels
Falken 215/35-18 tires
Bisimoto-spec Action 2MS Clutch
Buddy club racing steel lug nuts
StopTech brakes
Exterior Modifications:
Gatorwrap custom laminated body wrap
Type 2 graphics
Denmatic design scheme
Bisimoto Extreme Dimensions hood and aero upgrades
Burns Stainless muffler and hardware
Interior Modifications:
Buddy Club P1 racing seats and harness
Bisimoto reservoir socks
Racepack IQ3 dash
Bisimoto fighter special control box
Odyssey PC-925 dry cell battery
Rywire mil-spec harness
G&J braided lines
Rueda interior paint
Honda "First aid" kit
//youtu.be/http://www.youtube.com/watch?v=uZ8ZVOCFtW0&feature=youtu.be