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See my signature for mods on the car and on the way. I hope to run mid-high 12's @ 107-108 in the spring with my new set-up (Intake, LT headers, X-pipe, Borla Stingers, 3.42 rear, computer tune, BFG Drag Radials).
Am I about at the limit of performace upgrades without going to internal mods (heads, cam, etc.) or to NO2 or supercharging? Are there any other mods I should consider?
You need a good hi stall converter to go along with your 3.42 gears. A converter like the Yank SS3600 or SS3800 will do wonders for your cars performance. A good T/C is the biggest and the best bang for the buck mod on an A4. You should install your gears and T/C at the same time to avoid paying for labor twice if you install them separately. You also should consider installing a cold air intake like the Vararam. With the other mods you are doing along with a T/C, CAI and a good tune your car should run mid to low 12s. On a cool day with excellent weather & track conditions it might be even possible to dip into the high 11s once in awhile. Good Luck!!!