I contacted Tire Rack and they replied:
Thank you for your email. We normally facilitate all of our manufacturers warranties, however, Koni has asked that customers contact them directly for warranty issues. They can be contacted at 859-586-4100. They are a very nice company to work with but I am unsure what their turnaround times are. I have attached a copy of your invoice to help answer any questions of theirs. Please let us know if we can be of any more assistance.
Here is what Koni’s website states:
HOW TO OBTAIN KONI WARRANTY
(You Must Have Authorization Prior To Returning Products) Koni Warranty covers factory defects to the original retail
purchaser of the dampers purchased after May 1, 1980 and suspension kits purchased after 1995. It does not cover worn
bushings, shocks installed on a modified chassis or springs sold with kits. Warranty is not transferable. All replacements
are new dampers from stock unless notified as such. Forward below documents to receive a Return Goods Authorization
(RGA) number:
Copy of proof of purchase (dated after May, 1980)
Current vehicle registration.
Completed copy of warranty request form at https://www.koni.us/secured/warrantyrequest.cfm
At your discretion you can either send your units in for evaluation and have them replaced or request replacements in advance
at half of listed “Retail Price” (as found on KONI North America - Home Page). If replacements are made in advance KONI will
charge your credit card prior to shipment and refund the purchase price after the units have been accepted as a warranty.
If the units are not accepted as a warranty the returned product will be returned to you and the charges will remain on your
credit card.
Please fill out form and fax your documents to:
Warranty Fax: (859) 334-3340 Please include warranty request form.
Please call Warranty/Customer Service Representative if you have any other questions or concerns.
The telephone number is (859) 586-4100 Option #6
I have not had the time to contact Koni. I plan on doing the replacement request in advance so I do not have to go through the trouble of taking out the shock twice. I will let you know what happens. However, it may take a couple of weeks.