I think to answer the original question, Sky888 answered it, yes it will fit (he had it), tuning has changed when it was on his car so the goal for OP's numbers seem that they can be met, but is it the right turbo for what you want it to do? The cost was not addressed (at least not that I saw on this thread) but this thread took a turn that didn't need to go.
I too have considered an upgrade to my stock turbo. With all that I have added to my car, it drives fast. More than my old 70 Datsun 1600 or 63 bugeye sprite ever pushed out. To be fair, this is a completely different kind of car in a different time. If my Grandma had a stock turbo GXP rather then a new Dodge 400 in the 80's, she would have been bad a$$. Tunes and upgrades were not important, it was style. I don't feel like getting opinions from a forum full of opinions based on there experience is a bad thing. People have different set ups and is one better than another?
People have different desires in what they want their car to be and do.
I like power off the line and the 0-60 timing rather than high speed. I know with a ko4 and a tune, my car can get to high speeds. I know the ko4 has a quick response with spooling but limited hp. I don't autoX or drag race, I just enjoy what it does where ever I'm at. In talking to a Phoenix owner who sold his car and then sold his turbo separately, he said if he did it again he would have kept the smaller ko4 rather than upgrading to the Precision 5558b kit. Even though it gave more power, it lost the sweet spot timing of the turbo response. Again it was just an opinion, for someone else it could be perfect timing for what they do.
For me, my consideration is quick spool and the drivability like it was a daily driver. I like my punch of the turbo early but I also would like the punch be a little harder (at or under 400 hp to keep with the same internals safe). Oh and cost, dang if I'm not cheap. So does the DDM 2871 or the Werks WR1 or even the Hahn 20g get me to this place? I ask the opinion of those who have the set ups answer. I'm not a turbo guy and I've not read everything about them. I like simple information and not every detail data log. I've not read what they all mean, that's just me. I'm not wanting to reconfigure everything to make a turbo work (although some are very cool to watch be built). I'm not looking to add a fifth fuel injector or add water-meth or NOS. I'd consider an external BOV as part of the upgrade but would like to keep recirculating since it sounded like the non's tend to create MAF issues (based on just opinions of experience of owners from our cars). I'd like a safe for the engine, bolt on and tune upgrade that spools the same and adds more kick when the turbo boosts.
With all the different turbos out there I get lost on what does what. ko4, gt, gtx, efr, ppe, 3076r, 2871, 6758, 6255, 6258, 5558b, 666bs. I know they are different sizes with different capacities. I see spending around 1200.00 or less as somewhat reasonable for my goal (again, I'm cheap, I want to pay less and will wait for it when its cheaper). Your opinions on turbos for this...
