Just tuned a bolt-ons (lid, headers, catback, 3.73s), A4 car (2002) a few weekends ago. Made a baseline pull and AFR was only off by 1/2 point. Got 3 hp from leaning it out to ~12.8. Then, got another 7 or 8 hp by increasing timing 2* over stock for a net result of a solid 10hp & 15ft/lbs.

Basically, the steps are to get the AFR dialed in as suggested in the tutorial (don't have to increase the VE by 15% on a near-stock car - 5% should be sufficient). Then, get on a dyno to see what timing it likes.