My turbos are shot and I have a spare set that I bought for $200 that I don't really trust. Should I put new CHRAs in the spare set or use them for cores and get the rebuilds I see from Concept Z? The rebuilds are the cheaper option but my mechanic has told me in the past not to trust rebuilt turbos. This is what concept z says: "Turbos Direct is an official Garrett Turbo Distributor. They rebuild turbos to Garrett Specs and precision." And they come w a 90day warranty.As always I thank you all for your advice.