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Exhaust backpressure is always an evil thing in turbo engines. Turbos are powered by the pressure differential between both sides of the exhaust turbine. The bigger differential, the better response time. You want max exhaust pressure on the inlet side of the turbine. For the most part, you do this by sizing the runners in the exhaust manifold properly and by coupling the turbo as close as possible to the exhaust port. The exhaust pressure on the other side of the turbine is kept low as possible by simply using the least restrictive exhaust system possible given the set of real-world constraints (noise, emissions, fitment, etc,.)
Cheers,
shiv
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