dinwood

My 2006 Legacy 3.0 spec B sport tourer has a bank 1 cat problem (efficiency below spec) which brings up the engine, stability control & cruise lights. I can get them reset but they come back after a week or so. Emissions are well inside legal requirements and as I can't really afford up to 2 grand to replace the cats, I wonder if anyone knows a company in Somerset or surrounding counties who could remap the ecu to make this problem go away.