Quote Originally Posted by mossaidis View Post
* - though reviewed briefly, I did not find these allowances referenced in the rules yet.
STx rules are multi-fold. Note that the opening sections of the category regs refer to all STx classes (except as noted), then each has its own further class restrictions. So if something is allowed in the main category regs and not further restricted the class regs, then it's allowed. Further, some things not specifically allowed in the category regs may be allowed in the class regs.

Given that, within the category regs the front windows are allowed removal in F.7, plastic windshields in F.8, side windows F.10; hoods and hatches in STL-specific rules A.1.