| The hardpipes hold higher boost slightly better. They are more durable too if you take them on and off a lot. I am on my third set of stockers now, as the first two sets were causing boost leaks. They will soon be replaced with hardpipes And if you need a third reason, you can mount blow off valves to them in the optimal ,mounting location. But i suppose if you didn't care about performance/function you could just buy them for looks.
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