Raptor, you want my suggestion on a couple of Busa roads...
One is Highway 7 out of Tacoma down to Morton, good twisty day ride. For that matter, the circuit around Mercer Island is great too.
But the REAL one is Highway 243/240, to the Tri-cities from I-90. Go east on 90 to where you cross the Columbia River at Vantage. Go south on 243 there. You will go up into the hills for a few miles, and then....open her up!! There are a few Staters out there, so be careful. But if you really want to find out what full afterburner feels like, that is the best road close to Seattle to do it on.
Have fun!