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How badly does a sports cat restrict power and which is the best?
Reading the regs for Hillclimbing, it appears the road going class must have a cat if the car came with one. So that's my idea of a decat gone. It's a widetrack Prodrive STI so unless it's been changed at some point, it should have the Prodrive sports cat.
How restrictive is it and should I replace it with something newer/better? If so, which?