Well I installed it last night and did a throttle reset after it was installed and before I drove it (I didn't disconnect the battery).

Before I installed I looked up into the foot well at the throttle pedal and could see the Plug almost enough to remove it. I found a plastic panel there (quite thin and flexible) and by pushing it up, could nearly do the install. I removed 2 "cross head" screws in this panel and just pushed it "up" and out the way. This meant I could pull the plug out and install the sprint booster with ease. The only problem I encountered was removing the plug as the "tabs" need quite a firm squeeze and as I was "pushing up" on the plug more than "pulling" it was a tad difficult due to not being able to get much force behind it due to "cramped conditions" in the foot well. Total install took about 10 mins including the throttle reset. I recon you could do this in 5 mins this way after doing it once and knowing what to do. I don't know if it makes any difference that mine is a UK Car.

Wel, now the bit you are all waiting for with regard to the "A2" Sprint booster and how it worked. Well I wend out for a drive for about 1 hr. The car was already "warm" as I had driven back form work so could cane it pretty much straight away.

Pulling away is much more "instant" and requires less throttle movement for better results. It now launches like a catapult "off the mark" rather that a surge that builds. Down changing (1 gear or 2) is much faster, it is almost as if the car knows what you want, just as you make a demand on it. I barely needed to change manually at all, only if I was going to floor it at 40 when it was running along in 5th, but saying that the down change of 3 gears was slightly better anyway. If you down shift to 3rd (at 40) and then floor it, that was quite interesting as it only need to drop 1 gear before it tries to break your neck.

On accelerating in 1st there were 2 benefits: the fisrt being the instant "Shove" off the mark the 2nd being that it seems to get the power down so much quicker that the "G force" in 1st is noticable stronger, it reminded my of the Subaru Imprezza STI PPP I had before the SRT in 1st gear. The SRT is quicker on the run that the STI was but never had the sharp "snap" and "push" in 1st...now it is equal there too.

Now, I know that the sprint booster does not increase BHP, but I recon that the "snap off the mark with no softness to the launch at all, would save a 10th of a second on the 0-60 MPH and the delivery of power in 1st and the extra push it gave (when getting the balance between traction and wheel spin right) would save at least the same again, so in my opinion the whole Car is much more drivable and "snappy" and it always feels like you are riding on the back of Evil Demon that is waiting for you to say "come on then, lets play" and the moment you plant that pedal into the carpet it rears up, rips your spine out and beats you to death with your own scull !!!

I still find the best "launch" is achieved by putting it in 1st, holding the brake pedal with the left foot (to stop you "creeping") and is you hit the pedal, let go of the brake. This needs to be a small sharp application of the throttle (to limit wheel spin) and when that is controlled plant the throttle into the carpet quickly. In comparison to before, it feels like I never used to get full throttle" is is so different, but so much easier to wheel spin until you get the balance right.

Summary:
0-60 is definitely improved.
Gear changes more positive and quicker.
Grin factor, better that when you test drove and thought, Wow I must buy one.
Round town, just as smooth as before and no control issues with being over sensitive.

If you don't have a Sprint booster, go buy one as you won't regret it. I have always thought there was something missing, now there isn't !!!

Enjoy...