I just got off the phone with Mark. He was very easy to talk to and took the time to answer any questions I had. I ended up ordering a SS 4 into 2 with 12" cans and 2.5" outlet and open end caps. He said I should have them in about 2 weeks. My only concern is the noise level. There are very few Max's around here and the I have never seen one with a Marks in person so it's hard for me to tell what can would be loud enough. Now I have to get ahold of Sean for one of his Muscle kits. That should keep the monkey at bay for a bit.