Stick a shit load of oven cleaner inside the pipes then plug the ends and shake it all around for a lil while and let sit for a half hour to an hour. Then shake it again and unplug and drain then rinse with water. Try your darnedest to not get it on the outside of the pipes.
Lightly grease/lube up the o-rings at the bottom of the pipes with your finger, any kind is fine. Then stick the pipes on the exhaust port opening and wiggle them around till they go on as much as you can, ( yes you will need some muscles some times as some are stubborn as all hell) then grab your springs and stick them on. I stick them on the motor side first then i use needle nose vise grips to stretch them and get them on the pipe tabs (yes theres a lil tool for this but why waist $10 on one when needle nose pliers work good). You should Have to force them on and they Should be a bitch to get the springs on, harder to get on the better, so that will snug the pipes up to the cyl fully. If your springs go on real easy, then there too worn out, so get 4 new springs, there cheep. Also if the o-rings are worn, cracked or have a decent flat spot, replace them now since there off, then they wont leak. Again there cheep.
Just twist and turn the pipes every which way till you find the way they go in from the side, every style of pipes kinda go in diff,. They will go, just you will find the way by turning and twisting them around till they go.
After that the stinger tubes will line up good.
So why is it "shame on you"?