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Same engine as my car.
What maintenance has been done to the car over the last year?
There's a number of things that can cause this. One-way valves, inlet leak, boost leak, split pipe, dodgy...

Mine peps up noticeably when I change air filter and plugs . If you havent done them for a while its worth a try , worth checking for boost leaks too, intercooler and hoses can split .