If it's not a Roush it could be a GT with the
www.ClassicDesignConcepts.com side exhaust kit. I think their kit has squared tips on the 99-01 models.
Either way i'm sure it looks cool
Brett
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66 Tahoe Turquoise Coupe
Laser Red 96GT Ragtop
30 Years & 30 inches apart in the driveway!