When you buy a car, the cost isn't so much the materials used as it is the research and development. The cost is determined by how many sales are expected vs manufacturing cost and time spent on R&D. If the kit boosts torque above 300nm across the rev range and brings the 0-100 under 5.5 seconds I'll absolutely pick one up. Chasing that kind of performance from an N/A setup will cost a lot more than $8k. Day to day drivability with an SC will be much better too.
Also remember that 50hp doesn't sound like much but on a 1,200kg it'll boost performance much more than on a car with 150kg higher kerb weight. Drop 70-80kg in kerb weight and you'll notice it even more.
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