If your going the stage 1 route it's worth doing alongside a remap, silicone larger bore turbo intake pipe, upgraded panel or cone filter and possibly an exhaust to get the most out of it but alone not really necessary and then at the same time it's worth declaring to the insurer. Declaring mods individually may add up the cost rather than going big bang but also worth doing the work once your with a performance/modified car insurer where most mods will barely add any extra.
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