Where did you get yours tuned? I live in Houston too and don't have a tuner yet. I already installed the ams heat exchanger and hks blow off valves and was considering remote tuning with ams or possibly taking a trip to Illinois when I have vacation to get it tuned along with the fuel pump upgrade installation. But if there's a good place in Houston that'd be great!Difference? The LDP and CBE made a great difference in the quality of sound. The car seemed to drive about the same. Maybe a bit more grunt. The tune seems to have created early torque and a long flat curve above 400 between 3000 and 5500 rpm. It's a beast. The car pulls hard in any gear. The tune made the transmission shift a little more firmly and quickly in Sport+ mode. In standard mode, the car seems about the same until I get hard on the throttle. Then I better be paying attention.
For example when exiting my neighborhood, I must accelerate from stopped to 55 to blend with traffic. Most of the time the traffic only presents small holes. The asphalt is polished and I've never gotten good traction wet or dry. I used to accelerate gently to 20 and then lean on it to blend with traffic. Now however, if i get on it below 40 the car will lose traction. All that torque is new to me. I like it.
The car definitely is quicker than stock. The dyno backs that up. The power band is wide and very useable. If I were to give the butt dyno impressions, I would say about half of the difference came from the exhaust changes and the other half from the tune. The HE makes it possible to pull hard after sitting in traffic on a hot day.
Drove my son's S3 today. The S3 is quick, but it does not pull like my Q. I like mine better.