I don't know how things are nowadays but we used to be able to pick up slightly used performance parts from people that didn't do enough research into what it costs to make proper upgrades (there's always a bunch of other upgrades that need to be made). This leads them to cut corners to finish the install which leads to disappointing performance. Instead of fixing the problem, they bail out. Just be sure to inspect everything - no telling what they may have screwed up.
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