The 2007 Civic Si Sedan Concept is a close representation of the production Civic Si Sedan that will go sale this fall (2007). This is the first time that the "Si" performance mark will be available in a sedan version. Similar to the recently introduced Civic Si Coupe, the production 2007 Civic Si Sedan will serve as another performance leader for the Civic line-up with a 197-horsepower, 16-valve, DOHC i-VTEC engine with an 8,000 rpm redline, mated to a close-ratio, 6-speed manual transmission. Helping to put all that power to the ground is a helical-type, limited slip differential for improved traction and cornering performance. The 2007 Civic Si Sedan will basically be just like the Civic Si Coupe, except with the convenience of four doors....