I was unhappy with the throttle response on my automatic '06, so I had the Dinan stage 1 software installed, which does reduce the lag quite a bit. It also changed the shift points when in manual mode, which I never liked in the first place. I have been very happy so far, and wasn't put off by the $300 price tag. I also put a high flow air filter in because that is what Dinan recommended.
2006 Titanium Silver, Terra Cotta Leather, Premium, Dinan Stage 1 Software, Dinan Pedal Set, Roundel Replacement