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Are you looking to modify the car? If wanting to keep it standard I would look for a non-GPF(sometimes called OPF) car as they are louder as standard.
Believe BMW compensated for the filter to keep the power the same.
One thing I will mention is to get one after the tax bands changed as they’re much cheaper.
Once you start modifying they’re fairly similar, just with the added need to remove the GPF if going for catless downpipes and power.
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