Costco is not going to sell the extensions if u bought the slx model. You will need them if u want to use the slx qj to lift the Shelby at the proper lift points.
And yes it will sit higher in the fully down position with the extensions on the slx vs. the ext model. Check my pics above so u can see what I'm talking about.
And yes it will sit higher in the fully down position with the extensions on the slx vs. the ext model. Check my pics above so u can see what I'm talking about.