Nah! Got about 2000k on it before tune. Went in with 146 hp came out with 166 so mechanic did a fair job on a "by ear" tune to start with.
The tune got the Ebc up n running cos was a mob of nuffies , me top of list, when it came to that thing. No idea about AFR, all 'ol mate said was he leaned out the bottom end a bit.
All Greek to me anyhow. As far as mechanical shite goes I know enough to turn the ignition key.