Hmm, I know that there was a difference between the 98 and 99+ trottle bodies. I
think that the 98s were angled, and the 99+s were straight becuase of the shift to an electronic trottle, or "drive by wire." Anyway, the 98 requires a somewhat differnt intake.
I have the Whisper Lid on my 00 camaro, and love it. Its a lot cheaper then the K&N too.
heres one for the '98
http://www.lmperformance.com/1618/13.html
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Apperance Mods: Firebird wheels of mysterious origin

, Floormats

, and a quarter sized dent behind the passenger door from a TV I dropped!