Hello, I just recently bought some used Screamin eagle slip on pipes for my 2011 SuperLow. Is there anyone who knows exactly how to put these on? Do I need new clamps or can I just use the stock? I got a very good deal on these, heard mixed reviews but I couldn't pass up the deal. These have no scratches or anything. Please let me know, I am new to bikes and want everything right. Thank you all for your time.