Just got back from the SRT Nationals watching Scotty and LiNay White whip through the Autocross course in their SRT10 ----- too wide , I think not. Ran a 1998 GTS years ago and took two top time of days with the old too wide car. Just a perception that can be proven wrong. It is always funny to hear these comments as the guys running in C Prepared run Camaros, Mustangs, etc with flared fenders and monster tires that make the Viper look downright skinny, yet no one ever mentions they are too wide.
So hang in there and don't worry, it will fit just fine.
Watching LiNay ( SCCA Solo II Champion in a Viper ) whip through the cones in Topeka surprised alot of folks, as this petite young lady hammers around the track with a ton of authority. Trust me, the Snake slaloms very, very well.