GTIfan99
Autocross Champion
Have you tracked or autocrossed an MQB car?I'm not so sure. Lowering a car offers the advantage of lowering the center of gravity at the tradeoff of leaving your roll center behind (control arms now rest at a different angle), have an uneven loaded sway bar, and alignment issues.
There are fixes/bandaids to these.
Roll center - Can be mitigated with "roll center ball joints" which lengthen the control arm attach point which fixes their angle by a small amount. You can also just get a beefier sway bar so that you have better body roll resistance, although this comes at the cost of dropping the subframe for a time consuming job.
Uneven loaded sway bar - adjustable endlinks
Alignment issues - The car from factory is designed to be a fun daily driver and not a weekend track car, so adding some extra camber will benefit at the track but wear the inside of the tires a bit quicker. It's not that bad, and with adjustable coilovers you can raise the car when dailying and drop it + camber it for the track. Or you can get a camber plate, or the ball joints that slide a bit (cheaper and fix your roll center).
No doubt the car from factory has it's suspension tuned for great handling with good ground clearance, but that doesn't mean that lowering the car doesn't offer performance benefits.
I have with 3 of them now and driven 2 others on course.
The issue with lowering is three fold.
1. Roll Center
2. Lack of travel, getting you into bump stops.
3. If you cut bumpstops to gain back travel, you end up in the bad part of the camber curve.
A slight decrease in CG isn't going to make up for all the pitfalls. On the street? Who cares, do what you want, you'd have to be stupid to push the car that hard on the street anyways. But on track, I have a better CG advantage by opting for no sunroof and I don't have to deal with the other issues, and they are real issues at 10/10th on 200tw or lower tires on track.