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I have seen some cars with head work, cams, standalone and S15 turbo making 330 whp on DD, and 355-360 on DJ but cars were running around 18 psi and had almost 18 hours of dyno tuning into them.
With enough fine tuning and money spent on tuning you can really push the limits of various setups But with fly by night and all the low balling and lack of money investing in these cars in the actual tuning of the EMS sometimes the real full potential is never met. gotta pay to play.
I think the 2871R is still the best option for a good bolt up 300-360 WHP turbo on pump gas with minimal EMS, ROM retuning for a street setup. With a little more time in tuning and Haltech or better EMS on a good dyno you can see upwards of 400 whp even on pump gas with the right boost and timing. Motor and everything needs to be in tip top mechanical condition though. Some of these container motors and even the rebuilt ones are just not put together as well as they could be, this will zap outputs and probably why from setup to setup with all the external mods being equal many cars have very different actual road power outputs.
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My gt28r setup put down 33~hp @ 18psi with stock cams, I backed it down to 14psi making 289hp and just kept on tweaking my tune. Every car is going to be different, picking a turbo then tuning it for performance is key, reliability comes after. For obvious reasons!
I think my engine has been beat to death and I believed I got my money's worth and that's why I decided to start pushing the envelope. Even before I put the 2560r on people kept telling me I needed a head gasket, and I wouldn't be able to make 300hp without cams, and I should just go t3 top mount and call it a day. Ok which t3 should I use and what kind of management to you recommend, They had no clue. So I said you want me to do a full rebuild for an 50 extra horse power? Lame's!
Now don't get me wrong, I'm not suggesting you don't rebuild or add a head gasket and studs cause I make my money this way, but research is not just reading what people recommend, but why they recommend. In my case If there is a problem, I what my head gasket to go first. If you need to know why you need to do more research!
So for the OP the best all around stock replacement turbo is the gt2871r. 64. with this turbo you still have options if you need to upgrade. Just with housing options you can add at least 50hp for compressor and another 50hp for exhaust est. and my understanding.
but none of it matters if there's no tuning! So on a decent running engine and minimal tuning and 17psi, z32mafs 555 or 650 injectors I'd say you'd have your 350 easy! I personally went with z32 and 850cc, and an external gate, but I'm not trying to limit myself to 350hp. I make that with the waste gate setting basically!