Im so glad this came up. I was thinking similar idea with compound boost recently but with a super charger. Stumbled across HKS super GT. Figured if, there is a way to mount it by the intake side with an excessive intake to free up some room and work out a bracket/pulley system it should be a killersetup for a ka. Just have your turbo, then have the cold pipe link right up into the supercharger. The cool thing about the hks it has a bypass valve so you could have whatever boost at low rpms hit then shut it down once the turbo is hitting boost and have that take over completly.
The issue if you mount it up is do you feed the supercharge into the turbo or feed the turbo into the supercharger. I havent done crazy research but something like the lancia delta would work out great if you can bolt up the hks.
