It also depends on what you are looking to do with the car. We bought 3 kits for our 370z and none of them could make it around the track more than a lap or two before the car went into limp mode from oil temp.
So we had to develop our own kit, and we still get complaints that our kit is a lot more than others. But we always explain that if you are tracking your car (or even spirited street driving), going into limp mode after two or three laps instead of on the first lap isn't worth the money for a cheaper kit. You might as well not buy one at all.
So I would suggest first figuring out what you want to use the car for, then find a solution that has been verified to actually work.
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