[mikltov]

Originally Posted by steve99

Stage 1 tune is the safest one for EL catted header

If by chance you get the P0420 cel code for cat efficiency thrown (its not disabled in stage 1 tunes, just disable it using romraider.

If you get no knock on that tune you could try the stage 2 EL tune, but it runs more timing advance (and more fuel) than stage 1 tune, you will also need to monitor your AFR.

Its unlikely on our 98 ron fuel you will be able to run the stage 2 tune with a catted header without encountering considerable knock.

You could run the stage 2 EL E85 tune if you wanted to switch to E85 fuel and the E85 tune.

Thanks heaps man!!