What I'd really like to know is how the Performance Pack may help put all the power down off the mark compared to the standard GTI? From what I've read I think it might.
Surely only if one wheel has less grip than the other? If they both have grip, or both do not then would it make a difference?
Given the GTI is front wheel drive and has more than enough torque to defeat the grip of both front tyres, there will be little difference between a standard and performance pack GTI until they reach the speed where they are no longer traction limited.
Then, depending on the relative power/torque curves the Perf Pack should pull away... but looking at their relative 0-60 times a difference of 0.1 seconds... about 8 feet, just over half a car length.
The limited slip diff will have little effect in a drag race but should be a big help in and getting out of corners where there is a difference in grip across the front axle (mainly due to weight transfer across the car), then you should be able to make use of more power sooner because the diff will deliver power to the wheel with more grip when the one with the lesser grip breaks traction...
I don't know how much better the mechanical lsd is than the abs/software based XDS+
