Twin turbos and twin charging...umm yeah...

You could try getting a ball bearing turbo from Garrett. Look into the GT28RS, or GT2871R. They have good low end performance and will pull all the way to redline. I believe the GT28RS is good for 300 WHP but has been pushed to 350WHP in the past. And the 2871R has been pushed to around 400 WHP. But you can make 250-300 WHP with the GT28RS an probably a little more with the 2871R.