Bolt-in won't cut it for competition, but you won't need to go chromoly either as standard 2.75 DOM is what you'll likely need unless they're spec'ing something oddball in whatever class you fit. I'm currently working on a full cage for my rally VX and have budgeted about $3K for the job, so you'll be looking at about the same for the materials and labor. It will still be driveable afterwards, but definitely permanently altered from the cage pads and carry-throughs.

There are a few pics here that might help from my rally project: http://www.vehicross.info/forums/sho...y+beast&page=2