power band depends on cam and head choice, smaller turbos with a smaller ar spool faster than bigger turbos with a larger ar, you can have a smaller turbo with a huge ar and it will spool slow as ****, there is alot more in making a good running turbo set up than just slapping any old turbo on a car, thats why alot of people go with turbo kits the turbos are sized properly for what your going for, my t67 spools up in the 3500rpm range but alot of spool depends on your exhaust set up like headers and down pipe size and how restrictive your cat back is or if your even running a cat back