The Si was redesigned for the 2006 model year along with all other Civic trims, bringing about significant changes since the previous generation. The new car comes with a 2.0 liter K20Z3 i-VTEC engine that produces 197 hp (147 kW) and 139 ft·lbf (188 N·m) of torque, while also including a 6-speed manual transmission (an automatic option is unavailable) with a helical limited slip differential. Spring and dampening rates 40% stiffer than non-Si trims and stiffer sway bars have bolstered the Civic Si's handling, with the car achieving 0.90 g of lateral acceleration on the skidpad.
It is also the quickest Civic Si off the line, with a factory 0-60 time of 6.7 seconds according to Honda, but with some tests posting times as quick as 6.3 seconds. Standard features include a moonroof, a seven-speaker 350-watt sound system, 17-inch alloy wheels with 215/45R17 Michelin all-season tires, and key-less trunk access.
In Canada, the Acura CSX Type-S was offered in 2007, borrowing the engine and drivetrain from the Civic Si but offering additional luxury options including leather seating. The CSX also features the front and rear fascias like that of the JDM Civic rather than that of the USDM version.
The 2007 model changes for the Civic Si include the addition of the Si trim for sedans, vehicle stability assist (VSA) (not available on Canadian models), darker silver wheels, body-color grille, a deck lid spoiler, reversed red/black coloring on the secondary gauge cluster, and Si-embroidered front floor mats. The introductory price of the Si Coupe increased by $800 to the MSRP of $21,090.
For the 2008 model year, the Civic Si received minor tweaks that include even darker wheels than the 2007 model and a new shift boot with red stitching. Mechanical changes included a new tire pressure monitor system, a new rear upper arm that decreases the amount of rear camber, and a lowered spring rate for the coupe to match the sedan. This was also the first year the sale of the Civic Si Sedan began in Canada.
from wikipedia.org
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