Nope just used the factory springs and put a line of silicone on them so they wouldn't vibrate all over the place. So far no issues with my springs. 500 miles.
I had Evo move the spring hooks down the pipe farther so factory springs would work. I think the last cans I got in the spring had this adjustment. The early ones did not. I think I modified the stock springs previous to that as they were too long.