In this context "N/A" stands for Normally Aspirated. Meaning, an engine without a turbo or supercharger. Like the 1986 Saab 900S I had in Colorado.
This was found on Rodentmaster's sig at SaabCentral.com's forums:
ODE to the N\A
"I have not TURBINE to compress my buttocks, O lord,
Pity will be thine when thoust can crap on with boost.
We of the 'N\A - N\A' knowst nil of the pulling glory,
Yea, to post, thy blight the day of those who pressurise their pipes,
Alas, suck be mine that my chariot breathes,
Strike me down for mine is an unworthy existance"
