C5 Kirkland

Next winter I will have to pass emissions. My (new to me) 1998 is almost bone stock, but of course, I am looking to add a supercharger with supporting mods in the coming year.

My big question is which headers/x-pipe/exhaust combo will still allow me to pass emissions in King County? I know they don't do a visual, but just plug in and print the results.

AaronZ51

Maybe someone in the know will chime in - otherwise, you might want to inquire with Dan @ Corvettes of Auburn since they do these types of mods (or another reputable shop who does them as well).

Kmcoldcars

Any mods will pass as long as there is no check engine light on or emission related codes set, assuming the check engine light works. Your car is hooked up to a scanner and checked for codes. No codes related to emissions and you pass.
My 1991 is supercharged, has a custom true dual exhaust with no cats and passes the sniffer up the tailpipe emissions test. Washington is not like California, thank God.

Mufflerbearing

You could also talk to Alex at www.carbconn.com as they are also a certified emissions station and do lots of mods.