Need to find a compatible catalytic converter for an older VW T5 3.2 (2006-2009) when OEM parts are discontinued, and understand aftermarket quality, cross-brand compatibility, and check engine light implications.

No centralized, reliable resource exists to check aftermarket catalytic converter quality comparisons, cross-model compatibility (e.g., using OEM from newer VR6 engines or different brands with same engine size), or check engine light risk for a specific old vehicle.