I think that any of the CF plate cars Ive seen would twist with the stiffner taken out thats why its there. I used to have an aluminum brace I made for my Tub chassis since I milled out the entire spine of the stock one it was like Josh Cyrul had on his last year. But I had to take it out even tho it stiffened up the chassis alot it would hold the tweak when I would go wacking the wall. After I took it out there was a little more flex but it didnt affect how it handled accept that it heald its tweak better.