Given how clean-burning the 2.2-liter I-4 i-CTDi engine already is, it wouldn't take much for Honda to make the i-CTDi meet the CARB 2007 exhaust emission standards for diesel engines. I could see Honda considering putting in a 2.4-liter version of i-CTDi (rated at 150-155 bhp) into the US-market Accord, provided Honda can get the 5AT automatic to withstand the high torque of the i-CTDi engine.