Originally Posted by
alaxfire
Wikipedia says the SL320 has 221 HP :
SL 320 with a M112 3.2 L 18-valve SOHC V6 (224 PS (165 kW; 221 hp) at 5600 rpm
Wikipedia is also user driven, and user supplied info...
Here are a few more reliable sources:
2004 Mercedes-Benz SLK-Class SLK320 Convertible 3.2L V6 6-speed Manual Features and Specs
2004 Mercedes-Benz SLK-Class Summary