The best bet is to get someone who builds cages to put one in a car. There are two people I particularly recommend, Brad Stacy (Brad Stacy Fabrication) and Lea Welch (Revenge Motorsport Engineering). Costs should come in well under $5K (closer to half), the correct steel sizes (diameter and wall thickness) and constructions must be used. The cage design must also be correct to be allowed by CAMS. We recently got caught out with a bolt in cage in a WRX that was sold as CAMS compliant and when we went to log book the car for rally, the main cage pattern and sizes were correct however it didn't have a double diagonal cross in the main hoop and the wrong type of bolt in brackets. Had to cut out and weld in some new bars to be compliant. The last thing you need is to spend time and money putting a cage in a car and then find it needs to be modified to actually go rallying.

Also as Wavey and others have said, the cage is best built as tower to tower to strenghten the shell and prolong the life of the car.

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