The HD8588 Turbocharger from Forced Performance is a great turbo for mild to heavily built LS motors.
With its 85mm compressor inducer and 96x88mm turbine exducer, you can expect to see between 800 and 1200 horsepower from a single turbo application. This turbo ships with a divided T6 1.32 A/R turbine housing which is well suited to the larger displacement motors with a good bit of cam and higher stall than factory.