u/Lapudinada

Hey guys,

I just installed an Apexi N1 resonated midpipe on my Lexus IS 350 AWD 2023 and I’m getting codes P0420 and P0430 (both banks).

I already have 90° O2 spacers installed, but the codes are still coming back.

Has anyone else run into this with a similar setup? What actually fixed it for you—different spacers, mini-cat, or a tune?

Appreciate any advice.