What type of metal cutting blade should I get for my reciprocating saw?

[nine_one_4]

I have a Black & Decker saw and I found these blades on their web site but which ones should I get for cutting the metal in the engine compartment and rear trunk area?

[RandyLok]

Metal cutting, 24th teeth per inch (assuming you're talking about the sheet metal).

The thicker the metal, the fewer teeth per inch.
24 tpi for 1/8" and thinner
18 tpi for 1/8 - 3/16"
14 tpi for 3/16 - 1/4"

[nine_one_4]

Thanks for the info.