450 at the wheels is what, 520 ish? I'd be looking at a Holset HY35 personally or even a HX35 with a 12cm exhaust housing, cheap to buy, super tough and produce the numbers, they're even great on spool times considering they come from big 6+ litre diesels.

Edit to say, they're internally gated but they're simple to blank off, that's what I'm doing for my Volvo build.