This complete kit contains all necessary replacement exhaust components (O-rings, pipe mounts, pipe to silencer coupler, springs), complete hardware and bushing assortment specific to the bike, sprocket bolts, rotor bolts, etc.
Okay, a lot of these kits give you worthless/ill-fitting stuff but I was doing a rebuild on a raced-out KTM and I'm so glad I got this kit. Used a bunch of stuff out of it, even comes with a pipe coupler, springs and O-rings, and I've still got a ton of spare bolts for when the time comes.
I bought this kit because the factory KTM exhaust parts are spendy. This kit has exhaust springs, mounts and gaskets. I needed one mount and one spring. The bolts are handy too but I'd rather have the factory KTM kit so now I have both.
The spring is the swivel type where the hook spins around in the coil spring 360deg. Well I went to put the spring on and the hook pulled right out. It did this for both springs. These are no tighter than the factory springs, just poorly manufactured.
If you need the springs, buy them separately. Otherwise this kit is probably good. The mounts were good quality and held up for one ride so far.