won't affect emissions (unless you get the y-pipe without the catalytic convertor and don't plan on using one)

I am curious though how much trouble a muffler shop will give me for changing catalytics....

Todd Christ SVT Contour Registry
MODS: KKM Intake, SHO Shop Y-Pipe, Bullit Fuel Door, Edelbrock RPM Resonator
'98 E0 SVT Contour #1037 of 6535