Originally Posted by RecoveringSaabaholic
That info was posted in reference to 05SubieRS, who has a '05 Subaru 2.5RS, which has a newer ECU/fueling system that spacers cause problems with. Unfortunately, you did not pick up on this and recommended he use one, and I was correcting this oversight.
Correct! And I know that because in '05 for the RS, the ECU uses the rear sensor for more than just checking for a healthy cat, and using a spacer would mess up the fueling.
So... Given that... What is someone with an '05 to do?