do you have a receipt/part number/etc from when the cat was installed?

even though its e15?

What trim? If you have the LX or EX, I wouldn’t expect too much oil burning, since you don’t have Variable Cylinder Management (VCM).

If you have the EX-L or Touring on an 08-10 Odyssey, you have the dreaded VCM-II system. This is the most problematic VCM implementation, and burning oil is not uncommon. If you intend to keep this van a long time, the folks on odyclub.com can help you disable VCM among other things.

Consider posting this to r/ft86 as well for BRZ-specific advice.

The emergency vehicle has the duty to clear the intersection before entering it.