| They take stock turbos bore out the housings, rebuild the chra, and install larger compressor wheels (garret gt28r). This is similar to what Z1, JWT, and CZP do on there basic turbo upgrades (aka gt500/525, JWT500). Not the best upgrade out there, but the price is right. Anyway, my review on them: I have the smaller ones he sells (not giant ones). The first set I had installed for around 1500 miles. The passenger side turbo failed due to an installation mistake (I blame myself). They shipped me out two new CHRA free of charge. I also found out these come with a 6 month warranty. I have had the second set in for around 2000+ miles and they are still running fine. They spool around 3000-3400. Running 14-18 psi. There are a few members over on 3zc that have had good luck with them as well.
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