No doubt they are an awesome turbo for the price, I would love to see a back to back against the precision. These things spool like a beast and there's plenty more in that turbo for you if you put the money in the right gear.
I've been running mine with the full race twin scroll manifold and made 560rw hp on ethenol with a 2.6. Made 500rwhp at 5500rpm
I've since upgraded the cams and valve train, cleaned up the head, raised compression, stroked to a 2.9 and ceramic coated the exhaust side .. Results should be up within the month
Old graph.. Rubbish photo but its 98 premium vs E85
Note the car made no more power past 50/50 ethenol/98