Not so much a restriction in flow, but it doesn't provide a proper tune length, nor transition into the turbine. For a Festiva though, it's plenty. There isn't much space for a proper manifold and using 400whp would be an engineering feat with a BP in that light of a car.
Blow it up and get another. What else can you do. I've put over 75,000 miles on this trans with multiple launches on turbo. It's getting weaker. But it's the original I put in my first b6t swap. G-series holds the power as long as you don't shift it hard.
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