Mine is stock still. I have had it maybe a month. Does fine on highway. 85 no problem. You start having power issues when putting bigger tires on without gearing. If you are just wanting 33" tires you don't have to worry about anything. JKs look dumb with any kind of lift and only 33s. The fenders allow for much bigger tires and it makes the tires look tiny. Especially if you are going with anything other than factory fenders.