DSC is basically right. If you are planning on w2w racing the car, there are two ways to go - start building to a rule book now or just run a bar until the time comes.
Honestly, I know there are some pre-fab 4 pt. bars, but I don't know of any bolt in cages (a la Autopower or Kirk). Even as for bars, I've seen more custom jobs on 240s than bolt ins (they fit better and you can have one and keep a sunroof). Personally, I'd get a bar now and worry about the cage later. A cage is a big expense ($1500 for custom) and a big hassle for things like getting in and out of the car. A bar is totally livable, reasonably priced, and resaleable when you upgrade.
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