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bigger turbo,better air filter,better exhaust system
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Did he not say more power without a remap?
A bigger turbo needs a remap!
And air filter and exhaust will not give any noticeable power difference!
Changing your N75 valve for a more agressive valve would be the cheapest. This would increase you boost pressure slightly, but again not that noticeable.
Although a remap is about £400 or £500, it's well worth it!