April 11, 20232 yr Yellowy orange ones are in MY1999 and MY2001 NA EJ202 Forester with block mount ECU The grey came from 2000MY EJ20 GF8 RX Impreza NA They are different diameters also, s must be different manifolds and not interswappable Gotta wonder why ....
April 11, 20232 yr just taking a wild stab in the dark, but my guess would be that the Imp is sold more as a "performance" car, the Foz is more utility either way, the o-ring on the orange one is toast.
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