I don't think you can plan to be competitive in any race series involving swaps if you're trying to stick to a hobbyist budget. Like the speed/cost/reliability sum, you have to choose between speed, cost and competitiveness. Spec 7, Formula Vee, and maybe even Formula Ford might work for you though. They are (relatively) inexpensive and you don't fall too far behind the leaders if you're getting outspent. The downside of course is slower laptimes than you turn in your WRX.
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FWD is the new AWD
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