Hi,
Not looking to start another controversy, but only trying to post information that will help someone else make a decision. I listened to these on youtube and said I have to have that sound. I read all the posts about how difficultthey are to tune if you have the fullsac head pipe. I decided to cough up $200 to give them a shot so I bought some knockoffs from American Cycle. I wanted to hear them for myself before I went through the expense and trouble of getting them tuned and replacing what I have (bike runs well with fullsac heads, 2.25 cores and mastertune) so the bike runs well. I found a Mastertune dealer nearby that can tune my bike, hopefully it works out? If not, I sell the knockoffs to someone that has the stock head pipes, if it does run well, I will still sell the knock offs and fork out the cash for the fluted tips CFR. I know this is a cheap sound clip with my Iphone, if you like the sound, you will absolutely love them live. This clip does not bring out that muscle car deep tone well enough. Hope this helps?
Here is the You Tube link: