Z-owned wrote:Stock turbo's can make decent power with proper mods.
This. Once I get my FMU system installed(instead of injectors) and a good tune, I should be around 400whp. That's with forged internals(had to do a rebuild, not really a power adder tho), ported stock manifolds, ported and polished heads, lightweight pulleys and full turbo-back exhaust. It's really all about letting the stock turbos breath easily.
However, our "Shanghai" turbo kits for the Miata use Chinese turbos and out of the 100 or so we've sold, we've only had three documented failures...IMHO, on a VG30DETT the turbos are just WAY too hard to reach to make a gamble on such an expensive part. If you must cut corners on a build and get cheap Chinese parts from Ebay, at least do it on something less critical/easy to replace...for instance, I'm getting an Ebay radiator for my Z. I plan on cleaning up the welds and pressure-testing it before I install it though.