This is the second set I purchased. $14.95 each. First set were 2 1/4" which I ran with no tailpipes.......NO DRONE, my STOCK TR w/ alchy ran 13.0 at 109 with street tires and pump gas. I now have 2 1/2" hooker catback, w/ TH downpipe, and all I can hear is my stock turbo spool........NO DRONE. Summit Turbo mufflers. Still $14.95 each.