Right now the only turbo kit I have seen in the making has a suggested price of 5K. A twin set is more of course. But the very valid point was made earlier. Why pay 40K + to rip off a good SC?
You can spend less money beefing up the internals, adding more boost and getting more power for quite a bit less money. The SC will give you more TQ where you need it without the spool time that you find in turbo setups. (LAG). A good roots / twin screw will probably be a better choice for this motor.