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So I was looking at the SCCA Rule book. I am running FSP, and was trying to figure out, are tie bars legal?? All I see is that no lateral bars that connect between sway bar mounting points are allowed.
I'm asking because if I get the DC5R rear sway, I want a rear lower tie just for piece of mind and support. Also, I plan on getting the Neuspeed X-Bar and just want to make sure these are legal. Thanks guys.

 
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I have to ask why you're running FSP, but anyways....
See SP rule 15.2.C, i think that clears the tie bar (it calls it a strut bar, but it does meet their definition of between suspension mounting points), but the Xbrace is almost always a no go. Its not necessary anyways.
I didn't read the rules superclosely, but if you can't connect the sway bar mounting points, that means that brace plates like Progress and neuspeed are out, although I highly doubt anyone will raise a fit about something like that on a local level.