I have been riding KLR´s for over 10 years and have some experience with aftermarket pipes. A Supertrapp for a KLR will probably not fit on a KLX. Even if it would, I would advise against it as they have completely different engines. The KLX is more performance oriented and would benefit more from a pipe designed for its flow characteristics. Check out ebay for used pipes or www.arrowheadmotorsports.com for new ones.