i have removed the Catalyst and im running a 3" straight pipe from the turbo back
yes it did run a little better then the rb20 ecu, sounded quieter and felt like a tab bit
more power.
then with the stock ecu i moved the timing to 15* and it ran super slow as hell and idles like shit.
my check engine light was even blinking lol i didnt even know it works lol
so only fully advanced does the car feel ok.
im going to try a CAS tomorrow