i have a Magnaflow 12599 for sale. She has been used for about 4 mos and is in excellent condition. I am going another route experimenting with my exhaust. I will sell her for $80 shipped in the intercontinental US with payment through paypal. I paid $140.
The muff is off now but there are plenty on the forum who have used this muff on their ride. If you remove the reso's it is louder than stock with a deeper rumble. It isnt as loud as adding a cat back system.
Seems legit. I want it to scream when I walk on it but when I am just chugging around a nice rumble is my goal. I'm gonna be cutting out my rezzys as soon as I tell my warranty company to see how I like that. I'll keep you posted.