When shopping for a GC kit for your P11 AGX shocks, you have 2 options:
1. Buy the kit made for the AGX shocks (above) & it will install with ease &... Show more; offer a firm yet controlled ride, with about 2" of adjustment.
2. Buy the kit made for the stock shocks....
Installing the stock shock GC kit on AGX shocks is time-consuming & requires quite a bit of tedious grinding on the KYB spring perches. Although this isn't a hard or complicated task, it is slow & needs to be very precise.
The advantage to using the stock shock kit, as opposed to the aftermarket kit, is that it uses a longer spring & threaded collar, which allows for a broader range of adjustment & better ride quality due to 2 factors: A. softer spring rates, & B. higher max height adjustment.
Picture 1 - this photo shows the larger diameter of the AGX shocks compared to the stock unit.
Picture 2 - this photo demonstrates why the metal mounting ring cannot be used...
Step 1. Break out your metal grinder (hand held or table-mounted) & grind the FRONT shock perches down (as shown in pictures 3 & 4, above). You will have to continually test fit the threaded collar, grinding & removing metal until you take enough metal off of the perch & the collar slides over the shock body snugly & rests on the leftover perch (picture 5, below).
*It is very important that too much perch material is not removed... otherwise, the sleeve will not stay in place & the shock will be useless...THIS STEP IS VERY PRECISE*
Step 2. Lightly sand the roughened metal around the perch & spray paint it so that it doesn't rust over time (picture 6, above)
Step 3. Remove the REAR perches from the shocks using a rubber malot or a hammer (above).
Step 4. repeat the grinding process from step 1 until you are left with a ring that will fit inside the threaded perch, yet still rest on step inside the sleeve (below).
Step 5. Install the new perch/mounting ring UPSIDE DOWN on the shock assembly(this is required to keep the threaded sleeve from resting on the shock adjustment knob. Repeat step 2 on the REAR perches.
Step 6. Install the threaded sleeves over all shocks... I used large rubber o-rings between the sleeves & the shock body to keep the sleeve snug & stop it from spinning while making height adjustments. If o-rings aren't available, duct tape can also be used... wrap the shock body tightly above the perch, & squeeze the sleeves over the duct tape & onto the perches.
Picture 9 (above) shows the completed shock assemblies with threaded sleeves mounted.
Step 7. Install bumpstops on shocks(aftermarket or stock bumpstops trimmed to 1" length).
Step 8. REAR: Install the remaining parts in the following order: spring, gold washer (supplied by GC), factory bushing, silver aluminum top hat (GC-supplied), factory upper mount, factory upper bushing, retainer & locking nut... tighten to factory spec & re-install on car.
Picture 10 (above) shows completed REAR assembly.
Step 9 FRONT: Install the remaining parts in the following order: spring, gold washer (supplied by GC), factory bushing, new upper mounts (GC-supplied) including new bushings, retainer & locking nut... tighten to factory spec & re-install on car.
Picture 11 (above) shows completed FRONT assembly. Show Less