Its easy , you can take off and use a hammer drill and smash the centre out ,,,have done many ,,,
Get all the middle (rock ) out and let it breath ,
or cut the seam and re weld ,,
the heat savings alone are worth it
Get it replaced with a high flow one if you're concerned about legality.
If it fixes the issue its all good, if it doesn't you get an improvement anyway.
Sent from my HTC One using AULRO mobile app
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