LHD AE86 headers and exhaust

[Bean]

as far as I'm aware the CR difference was tied to MAP or AFM versions and not strictly to the CAT. My friends car was an 87 and had to have a CAT but no O2 sensor and no 10:1 CR as it was a AFM car. They did lot's of mixing with the emission parts all over Europe. in the Toyota Parts Catalog they differntiate between models for Switzerland/Sweden and Europe for the LHD european market.