Street modified
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The CSL came with a factory carbon roof, I don't know what you're talking about(It's only a vinyl wrap)
Also it is allowed, according to N. on page 5 of the Street Modified category, page 111 of the overall SCCA Solo Rule document.
- Removable OE hardtops, T-tops, targa tops, sunroofs, moonroofs, and similar roof-mounted panels may be removed/replaced with alternate panels provided that the area of interface is limited to the original pe- rimeter of the t-top, sunroof, etc. or utilizes the OE panel mount points, and that the contour of any replacement panel surface does not vary from the contour of the part being replaced by more than 1.0” (25.4 mm) in any direction. The material used to construct the alternate panel and the method used to attach it to the interface is unrestricted. Any actuation mechanism and the associated wiring, if any, may be re- moved. Vehicles utilizing alternate (non-OE) hardtops will be considered as open cars in regard to Section 3.3.1.