They have been discussed in a post somewhere. Personally I do not like the gap they leave ... the link pipe is too long and there is a sound file on the Akro home page . Was expecting better sound for the money
Apologies never checked previous discussions/threads
just been on their home page and sure enough they have a great device for comparing sounds from the stock and slip on . The stock recording sounds very much like what is coming out of my exhaust so trust the slip on on is also a realistic recording. See (hear) what you mean! Ah well.