I'd really recommend a good understanding of the rules, not only SCCA, but also NASA, and some of the vintage sanctions, before you make a decision. One thing for certain, the Jeg's, and all of the other usual drag suspects (Alston, Morrison, etc) predominantly use welded tubing. Most of the road race bodies require either seamless (DOM) mild steel, or cro-mo, which is seamless also, in specific diameter and wall thickness. It will depend upon the class you want to run in many cases, and also the weight of the car. Further, the bends, location, doubler plate material, all weigh heavily. Unfortunately, this will bring the price of the cage way up in most cases, and will often, depending upon the car, require a custom bent cage. Some may state that it is a bit excessive in many cases, but, the bottom line is that a cage in a road race car is there for one primary reason: to minimize injury to the driver when bad stuff happens, and it can very easily. If you are going to track (road course) the car, I can't stress enough how important it is to pay strict attention to safety. While you are at it, I'd also look closely at a fire system (dedicated, not just an extinguisher), and other good sense aspects (such as a neck restraint system). Our cars have WAY more performance than a typical driver can handle, independent of ego. When in doubt, go safer.
Mark
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