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Old 03-12-2012, 03:28 PM   #18
Scooby Specialist
Member#: 91212
Join Date: Jul 2005
Chapter/Region: MAIC
Location: Martinsburg, WV
2011 WRX 5DR
Satin White Pearl


After talking to the tech @ Koni, I am posting answers to my own questions, for posterity's sake.
Originally Posted by phenryiv1 View Post
I have 3 sets of bumpstops.

It looks like the ones on the far left are for the front, but of the 2 sets on the right, I don't know which ones are for the rear. 1 pair came with my 2011 STi springs. The other pair came with my 09 WRX tophats.

Neither pair is large enough to go over the piston on the rear Konis, while the pair on the left fits on the fronts without an issue.

First, I don't even know for sure that the Konis require the re-use of the bumpstops, but without them in place, the dustboots seem to be just hanging out on the pistons.

Can anyone shed light on the proper bumpstops, any trimming that is required, and whether I need to drill out the center hole to make them fit over the piston in the rear?
The Konis DO require external bumpstops. The ones on the left are for the front. Of the 2 on the right, I still don't know which are the correct ones for the rear, but either set will do. Koni rep recommended either using the shorter set or cutting the longer ones by one "doughnut" ring.

In either case, using a drill to bore out the center to make it a little easier to press them over the topmount ledge is fine. Just don't drill out so much that they slide on the piston too easily.

Another option, for those of you reading this before undertaking the project:

Originally Posted by phenryiv1 View Post
Koni ships the struts/inserts with plastic discs. Are they to protect the pistons and the top of the inserts/struts during assembly, or do they stay in place permanently?
The discs go on and stay on, even though he said that they don't do much.
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Last edited by phenryiv1; 03-13-2012 at 09:21 AM.
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