PhilCutting

@TonyHSD Thanks for that info. I watched the mechanics fitting the plate for me. It was quite substantial and they reckoned that it would be too difficult for a crook to remove the bolts without serious lifting mechanism and powerful pneumatic bolt tools. Some of the bolts were seriously long, 100mm or thereabouts. I'll check out your references though. I used this company: Hybrid MOT Co, Hybrid MOT Centre , 44 Bideford Avenue , UB6 7PP https://www.ebay.co.uk/itm/TOYOTA-PRIUS-09-15-CATALYTIC-CONVERTER-ANTI-THEFT-PROTECTION-PLATE-WITH-FITING/113983002524?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

@TonyHSD Would these security bolts be the same choice for a Prius gen3 2010? Or perhaps a different size?

Hi Tony, have you had any negative results (ie: rattles etc) from fitting your cat protection plate?