I like some input on box tubing size recommendation for my street/strip Valiant. Currently running 11.70's, but want the capability in the future to add a cage and run deep into the 10's without needing to modify/re-build the connectors.

I assume the standard is 2"x3" box cut thru the floor and welded along side where it meets the floor pan. What thickness metal is typically used? .083" or 0.120"? I assume A-500 mild steel is suitable?

What about using 2"x2" so that it doesn't protrude so far into the floor? Real world experience with using the smaller tubing? I read above that someone did it and I kind of like that it isn't so intrusive into the interior, but concerned it won't offer the strength improvement needed.

THANKS for the input!