Invisible Dark

I did an 880 mile round trip in July. Edinburgh to Newcastle, ferry to Amsterdam, drive to Spa-Francorchamps and camp for 4 days to watch the 24 hours of Spa, then on to the Ring for 5 days in an apartment, 2 laps of Ring itself and drive all the way back to edinburgh. Barely used 2.5 tanks of fuel!

P0420 its the post cat sensor, OBDII and Torque informs me, 02 bank sensor below efficiency. Unsure of cell count on the cat.

If I was to do this I think I'd need to fit some spacers in to see if I can stop the CEL coming on due to the sports cat. Or could this solve it perhaps?

I'll be heading along to this for the sunday, got a track night at knockhill on the saturday (good bye tyres) Hoping to hit 15.5 in the 140

what front lip is that on the celica? looks like a non carbon version of the Seibon one.... great looking car combo there