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Reducing backpressure (with measures like larger cat-back exhausts, etc.) on a turbo engine is supposed to be good for it. Less so on a n/a ones, at least to the extent to which you can reduce it for the turbo model.
My '84 B23F non-turbo had its cat gutted by its previous owner. the engine has run fine since I brought it home from the junkyard.
It does look to run a bit rich, though, if the dirty tailpipe is any indication. But the A/F mix screw on the AMM was also "adjusted", so, who knows?
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"Can't understand why people abort Volvos, either"
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