I bought the velocities off ebay whuch are their discontinued 2 into 1 pipes for the vulcan. They are guranteed not to turn for one year. I also purchased the tip seperately another 200 bucks to set the pipes off. Les than 200 miles on them and where the 2 pipes go into one they are turning. So....we will now see how good their warranty is. Because I am 625 into these pipes plus mechanic to put on.