My car is a 98 ta a4 67k miles. I got the car stock in june and took her to the track and all i could pull was 14.1 @98 2.1 60ft i then got a cutout and changed the plugs and wires then ran a best of 13.8 @ 100mph 2.0 60ft. Now i have hooker long tubes with O/R y-pipe. now ran a best of 13.4 @ 104. my dyno #'s stock were 282hp and 300lbs/tq with the headers and cutout i dynoed 303hp and 317tq. My air/fuel was 12.0 across th board. Im getting a lid and custom tuning friday. My questions are, do you think its possible to hit 12.9 @ 107 with the lid and a really good tune? I know Im running rich. How much power and what times should i expect after the tune and lid. I know it all depends on the tuner and how good a tune it is. But just an idea? say....Best and worst case. Thanks in advance. Im excited abou this fri

 

You should see a noticeable HP increase by running a "leaner" 12.8-13.0 AFR.
That plus a good 60' might get you 12.9.

 

You'll need some sticky tires and get your 60' down to a 1.8 or so. The tune will get you .2sec and 2mph at the most. At least, that's what my tune got me.