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I had a quick look at some online catalyst & exhaust retailers, and although the VS isn't listed (surprise surprise), the Laguna 2.2 DCi (from the same period) is. It does have a catalyst listed for that engine/model, so I would presume your car also has one.
I would try to avoid bursts of heavy throttle, as part of the emission control system on a car involves part of the exhaust gases being recirculated in with the fuel/air mix. This helps to reduce the level of unburnt fuel/gas coming through the exhaust. Now, as the ceramic material starts to break up and rattle about in the catalyst cannister, fragments will be dislodged, and may travel (as granular powder), in through the engine - if this happens, it may score the cylinder bores - which will affect the engine's compression.
Not trying to worry you, but its better to exercise (over)caution, than throw it to the wind.
The reason I'm saying to avoid heavy throttle is to basically avoid the
spooling up, which will increase the pressure and airflow in the system.
All the best,
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater