Yes there is a lead gasket that you need to remove just aft of the downpipe where the cat-back exhaust connects. You need to put another gasket there. The HKS exhaust comes with replacement gaskets. you should not have to change the spring bolts. Just re-use them. The HKS exhaust comes with all hardware for install. Installation for the cat back is about 30 min. with the proper tools.. Have fun. it's a nice sounding exhaust.