1 perfectly sized turbo would be much better then a system like that. Most people who are modifying a factory twin turbo system like that put on matching turbos, and dump the diverters. I'd look at what GN guys are running...
There'* a 1.5L VW in europe that has a turbo and supercharger...
Frankly I wouldn't put a large one after the small one ina single exhaust pipe setup either. A HUGE part of spinning a turbo is the fact you're using hot exhaust gasses, and once they've gone though the smaller one would be expanding much slower. I'm also not quite a fan of the rear mounted turbos, and no intercooling.
'06 Vee Dub GTI 2 door Tornado Red
- 2.0 Turbocharged, Intercooled, Direct Injected, 6 Speed DSG, Underbody Aero, 17" Classix
- Moonroof, Bi-Xenon headlamps, Interlagos Plaid Sport Seats, 6 Disc In-dash, iPod integration, GTI Monster Mats (winter)
'93 Bonneville SE Purple Pearl H4U package - picked up June 23, 2003, Traded-in June 28, 2007...