Thinks he does mean swirl flap deletion. Can be a problem on BMW’s with the screws holding the swirl flaps coming loose, which get injected into the engine with catastrophic effect. Many BMW owners get the swirl flaps taken out and blanks fitted. I did it to my E39 BMW 525d.
I have not heard of the same problem on the Volvo D5 engines, although the swirl flap actuator lever can be troublesome. Not sure if that’s still the case on the years watson54z is looking at.
Hope this helps.
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