There is nothing more true in life than : YOU GET WHAT YOU PAID FOR.
That said, for an entry level kit; it's not that bad. I've no idea if the person complaining of mild steel vs. stainless had his headers heatwrapped, but ANYONE used to dealing with turbos knows that it's almost a given that you crack welds and manifolds when you wrap parts. It retains heat, which retains energy that is transferred into the turbo as it expands, but it DOES come at cost. Those looking to be serious know this.
2. Ok, so you bought a cheap turbo. A: The MP t70 upgrade is only $300. B: The worst I have seen from china casting turbos are cracks in the casting of the hotside. IF the blade comes apart it's going to have a rediculously tough time even getting through the intercooler, at which point it's just going to get blown out the exhuast. It's not like you drop a valve. You turn paper thin metal into TINY shrapnel. I've smoked a few turbos in my day on DSMs....ANYTIME....I REPEAT ANYTIME a turbo fails it sees bearing failure and it develops shaft play. The blades hit the housing. There's no getting around it; and you break the oil seals on the shaft allowing oil to get into both the hot and cool sides.
Case in point; you WILL be cleaning out your intercooler just the same with a $3000 turbo and a $50 turbo. Oh no, some oil got into red hot exhaust?!....it's going to be there for all of about 3min. It affects nothing.
Thirdly, the turbos are externally gated. It's a spring tensioned diaphram with a vaccum signal. If it fails, it's hanging open. The point of a wastegate is to allow exhuast to BYPASS the turbo and regulate boost. They fail very similar to a deadmans switch unless somehow it gets stuck closed. In which case, you SHOULD be monitoring your a/f ratio and if it's a serious enough car; it should have a knock sensor and an alarm. Running these mammoth turbos on 7psi is barely working the turbo. Running at 16psi is barely breaking into an efficeint part of a compressor map. These are huge desiel style turbos generally making 30-50psi. Not only is a large turbo not going to magically skyrocket to 50psi during failure, it's going to sound like you started a 747 in your engine bay trying to do it. IE: you know something is going to be wrong.
Aside from that, good quality parts should not be skipped over no matter who makes your kit. A wastegate is always the same $. If you don't like yours, upgrade it later. But it's going to take ALOT of heat cycles to even start to see an issue.
My $.02.
I just feel alot of people cry over lack of education more than anything
