On their web site they list the x-pipe as "50 state street legal." My performance guy verified this too. I believe they may have another one for the '05s that is not, but they are calling attention to the aformentioned one.
FWIW
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'05 Black GT Auto - Steeda Carbon-fiber CAI w/SCT SF3 tune, CDC sequential turn signals, Saleen HID Headlights, Ford Bullit Axle-backs, Steeda UDPs, Steeda G-Trac Suspension - Stage II, Cragar 610C 18" x 9" & Nitto Extreme 555 255/45ZR18 | 
Bassani X Pipe 
