Koni/Ground Control Suspension Install in 6th Gen with GC tophats and shock fork trick




The Parts

Ground Control coil overs. "Standard" rate 340 front / 250 rear.

Koni Yellow struts



Installing the Fronts

2 bolts on the bottom. The LCA-to-Shock Fork and the Shock fork pinch bolts

2 bolts on the top. The shock top hat-to-pillar bolts

One side out

Both sides out and disassembled

Remove the stock tophat rubber grommet.

Remove the tophat bushings and pin. a 10mm socket and hammer worked like a charm.

Re-install the oem tophat bushings, with the 12mm tophat pin that came with your koni yellows

Install the ground control rubber tophat grommet

Set your heights all the same, and hand tighten the hex screw on the GC coilovers. Assemble the koni/gc setup as shown:

-Re-install the shock setup into the tower, loosely thread on the top hat nuts.

-Re-install the shock fork and loosely install the two shock fork bolts.

-Place another jack underneath the lca and jack up the suspension until you just start to hear the car pick up off that corner's jack stand.

-Torque all 4 bolts to proper spec

-Lower the jack under the suspension and re-install the wheel.

-Repeat on the otherside



Installing the Rears


2 bolts on the bottom. The LCA-to-Shock and the LCA-to-Trailing Arm

2 bolts on the top. The tophat to tower bolts


Disassemble the old setup and follow the same procedure that we used above for the fronts

Assemble the new setups same as we did on the front

-Re-install the shock setup into the tower, loosely thread on the top hat nuts.

-Loosely install the shock-to-lca and lca-to-trailing arm bolts.

-Place another jack underneath the lca and jack up the suspension until you just start to hear the car pick up off that corner's jack stand.

-Torque all 4 bolts to proper spec

-Lower the jack under the suspension and re-install the wheel.

-Repeat on the otherside


Ride height

Check the ride height on a flat level surface.

At each corner jack up that side, loosen the hex screw, make your adjustments then retighten the hex screw. lower back down to check the new height.



Shock Travel

Shock travel is different than ride height!
This is something most people overlook, or don't know enough to look. Shock travel is how much room the rod of the shock can travel before the shock body is hitting the bumpstop. The lower you set your car, the less shock travel you'll have.

For reference. On my 6th gen with 14x5.5 with 185/50's set to 1 finger gap up front I had ZERO available shock travel with a cut 2" oem bumpstop. This basically meant that the shock was compressed almost completely; there was only 2" available before the strut totally bottoms out and this was being protected by my bumpstop.


How to fix this?

The shock fork trick. For the shock fork trick you open up the shock fork wider and remove the shock fork alignment collar from the shock body. Then you lower the shock deeper into the fork. This similates either having a shorter fork, or a shorter shock body. This allows you to gain up to about 1" of travel. Don't go too deep or the bottom of the shock body will hit the axle. This trick is only available for the fronts since there is no shock fork on the rears.

Side by side comparison. You can see this achieves a good 3/4" of extra travel.



Extended tophats This option can be done on the fronts and rears. You can buy 1" extended top hats from ground control, or you can weld up you're own. What you have to do is cut off the top of the top hat (the cup part where the 2 bushings rest). Then weld in a 1" thickwall pipe, then weld the cup part of the top hat to the top of the 1" pipe. Effectively you have moved the upper mounting part of the strut up 1". Don't go up too high or you will hit your hood. In the rears 1.5" is a good length.


I bought the GC tophats for the fronts :-).

Front's assembled with the GC tophats. Shock fork trick on the bottom.

Fronts installed with shock fork trick and GC tophats:


For the rears I plan on tigging up my own 1.5" extended tophats. Stay tuned for these updates.



Enjoy your new suspension setup


-Luke