If you want to get into real competitive 60' times, you need to be low,centered and stable. D.M.E. cut seat rail subframes are just one of many chassis modifications we do to assist with that, and the choice of most winning racers for a reason....They work! These subframes are for Hayabusa Catalyst 12" to 18" over tails and come in two versions. One for a Catalyst grudge tank shell, and the other for a stock fuel tank profile. Either model $500 plus shipping. Allow us to help you take the next step...Fast forward!