The Acura RSX debuted in 2001 as a replacement for the Acura Integra. From 2001 to 2004 it was offered in standard or Type S form. The standard RSX used the K20A3 four-cylinder engine that delivered 160 horsepower, while the Type S had the 200 horsepower K20A2. Both versions carried over unchanged until 2005. In 2005, the RSX went through a refresh that gave it new headlights and taillights, and an updated rear spoiler. The Type-S now came with 17-inch wheels as standard equipment, but the real change came under the hood. The standard RSX remained the same, but the Type-S got a K20Z1 powertrain that utilized the camshafts from the Japanese DC5 Type R, as well as the b-pipe, muffler and 4.77:1 final drive ratio. The standard RSX was offered with a five-speed manual or five-speed auto with sequential SportShift technology. The RSX Type-S was only available with a close ratio six-speed manual transmission.