The Eibach PRO-KIT 85109.140 is a four-spring lowering set from Eibach's street line, and the manufacturer describes that line as engineered to lower ride height, sharpen handling, and keep the car drivable every day. It fits the 2010-2013 VW GTI (5K, 2.0 TFSI) and the 2012-2013 Jetta GLI (2.0T). The springs are built around the factory dampers, so you can lower the stance without buying a coilover system. Owners on user forums say the ride feels a little firmer than stock, with less body roll in corners. Eibach's own test data for the GLI shows the wheel-center-to-fender distance dropping from 364 mm to 336 mm, which means less fender gap and a more aggressive look.
Shoppers searching for MK6 GTI lowering springs, 2.0T Jetta GLI drop springs, or Eibach Pro-Kit vs. H&R sport springs will want to confirm the drop for their exact model. The manufacturer's GLI figure is about 1.1 inches front and rear, while user forums report GTI averages near 1 to 1.2 inches. The manufacturer's spring rate for the GLI is 200-257 lbs/in against an OE rate of 211 lbs/in, so the handling change is moderate rather than race-stiff. Eibach positions this kit for street and occasional track use.
The manufacturer's test data lists the factory damper as the one used with the PRO-KIT. User forums report that drops of more than about an inch can feel floaty on stock shocks, and some owners upgrade the dampers to firm things up.
The drop varies by model. The manufacturer's data for the 2012-2013 GLI lists about 1.1 inches front and rear, while user forums report GTI averages of roughly 1 to 1.2 inches. Confirm the exact GTI figure with the manufacturer before ordering.
The manufacturer says the PRO-KIT can be aligned to OE specifications. Its GLI testing also showed rear camber sitting at the negative limit, so have the rear alignment checked after installation.
The manufacturer lists an approximate installation time of 1.5 hours for the GLI application, and the kit includes a new bump-stop and dust boot for each corner. Plan on a wheel alignment afterward, since the rear camber can sit at the negative limit. Owners on user forums warn that the lowered ride is more sensitive to potholes and manhole covers, so keep that in mind when choosing your drop height.
