Table:
text: Mercedes-Benz R230
First generation
Engines
Model Years Type_code Power_rpm Torque_rpm
SL 350 2003–2006 cubic centimetres (cuin) V6 ( M112 ) PS (kW; hp)@5700 N·m (lb·ft) @3000-4500
SL 500 2003–2006 cubic centimetres (cuin) V8 ( M113 ) PS (kW; hp)@5600 N·m (lb·ft) @2700-4250
SL 55 AMG 2003–2006 cubic centimetres (cuin) V8 supercharged ( M113 ) PS (kW; hp)@6100 N·m (lb·ft) @2650-4500
SL 600 2003–2006 cubic centimetres (cuin) V12 BiTurbo ( M275 ) PS (kW; hp)@5000 N·m (lb·ft) @1800-3600
SL 65 AMG 2004- cubic centimetres (cuin) V12 BiTurbo ( M275 AMG ) PS (kW; hp)@4800-5100 N·m (lb·ft) @2000-4000

Question: What year was the first generation of the engines of the Mercedes-Benz R230 SL 350 model?