Wallace is right, with that setup it will just be like having one big laggy turbo, except with extra weight, more complications, etc... If you imagine one CT9 is enough to give an easy 180bhp @ 1 bar, think what it's going to be like with two of them. And to the people saying two hybrids, two TD04's or whatever, there's no way a 1.3 is going to flow enough exhaust gas to run them. For the cost and complications and considering it's such a small engine, you're much better off spending the money on a ball bearing turbo rather than bodging a pair of CT9's or a cheapo Subaru TD04.