I would say that i am building a car that is verging on un-streetable. It will be driven on the street most of the time, but this car is not being built to go get the kids and pick up groceries: it is being built to strike fear into the hearts of everyone in town.
The reason i am concidering this turbo is that i wanted to get me hands n the new 71 or 74 billet turbos, but they have not been released yet.
That being said, the power output for the new billet 67's is higher than the old hpq 70's thus my reasoning to try them out. I will be upgrading to the new larger turbos once they do come out, but for now...i just do not know.
At the end of the day i need a 9 second car that can play on the street.
Maybe sticking with a 70 turbo might just hold me over for the time being.
The car I'm running this 6765 in is a full weight street car with similar goals. It should run easy mid 10s, low 10s with a little extra boost, and it will have the ability to run in the 9s if I wanted to lean on it. My only limiting factor is the virtually stock bottom end with this particular engine.
This turbo will run 9s and is perfectly streetable. If you plan to run deep in the 9s you may want more turbo. Just remember - bigger is not always better - especially when it comes to street cars with a little strip action. You can't have the best of both worlds - compromise! My race car runs 7s with a 91.5mm - I could drive it on the street but that doesn't mean it's streetable. I have to remind myself that not all cars are race cars. Good luck!