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I've had the Cross Frame fo little over a year now. I love it. Really helped to stiffin up the chassis. If buy another C4, It will have the Cross Frame. I never take the top off so I can't say about that, seems like it would be better with the brace installed. The Cross Frame is really well built and R-D Racing has great customer service.
Does not interfere with regular maintance, oil changes, etc. Only if you need to drop the exhaust, tranny, should you need to remove.