Stainless steel springs offer strength and durability that is superior to stock springs
Swivel hook making installation easy and eliminates spring binding, which compromises strenght
Multiply mm by .04 for inch equivalent
NOTE: When measuring for exhaust spring length, please use the following points for reference:
1. Wear eye protection when removing. 2. Exhaust springs should be measured when they are off the vehicle. 3. The length measurement should be taken from the inside of one hook to the inside of the hook at the opposite end of the spring. 4. For correct fit, an exhaust spring should not be extended more than 20% of its free length.
I have a race pipe on my 2 stroke polaris 4 wheeler, With the spring mounting left up to you. So the selection of lengths helped alot finding the right length.Also the outside diameter is smaller for fitting into tighter spots. The one end swivels so the springs not put into a bind.