When you lower your Lexus, you may end up with your front upper arms hitting your frame rails. In order to gain more suspension travel and allow a lower ride height, you can send your knuckles in for our shortening service. We will shorten the knuckles 40mm, which will drop the Upper arms down away from the frame rail. TIG welded, triple reinforced service done in a CAD designed jig to ensure symmetry. See list of models we offer this service for below. ~Send knuckles to the following address: Parts Shop MAX USA 220 Engel St. Escondido CA 92029 (if you do not want to disassemble your car while you wait for the service, we recommend sourcing used knuckles online and have them shipped to us) Price of $500 is for labor to modify one pair of knuckles. You can combine this shortened knuckle mod with 40mm roll center adapters available from other companies for major handling and suspension geometry improvement. Applications include Lexus RC AVC10 GSC10 RWD and AWD, 2nd Gen GS/Aristo JZS16x, 3rd Gen GS, 4th Gen GS GRL10 RWD and AWD, Lexus is300 Toyota Altezza XE10 98-05, 2nd Gen IS XE20, 3rd Gen IS XE30, GRX130 Toyota Mark-X, LS400 UCF10/20, LS430 & Celsior UCF30/31 (2001-2006) , **AWD 06-13 IS250 / IS350 are shortened 20mm.