I finally received my M2 dual tip catback on Friday and installed it today. I have read that most people think that the Racing Beat is better quality, but M2's (high tech performance) new dual tip seems pretty nice in quality, and it looks pretty sweet installed.
The good-

The Bad-

 

But how was the flow? I'm reading that the M2 Dual Tip has the best flow characteristics of any of the dual tip catbacks??

 

I have no way of accurately saying how much more flow this exhaust has over stock, or other. I can say that it must flow pretty good since, like I said before, I had to adjust my boost controllers from 14-15 back down to 10 psi.
I have recently converted to full non-sequential, and the M2 catback is now very loud compared to the sequential set up. I don't mind it too much, but I think I like the quiet tone it had before.
The non-sequential setup is much slower to boost in taller gears, but when drag racing you don't notice the lag at all. In fact, as long as you are above 3500 RPM full boost is very fast. I contribut the speed to the muffler.

 

pics please...

 

Hmmmm, so the M2 Dual tip is a bit louder than you expected? I was considering the M2 for a more quiet tone, and better flow. I have a Trust Sport Catback now. It's 6 years old March 2003, and the stuffing must have all but burned up. It's very loud at idle, and at low rpms...

In hindsight would have picked the RB dual tip, or are you happy with the M2 dual tip?

 

sleeper- i have the rb cb and love the low mellow tone. can't go for that ricer crap...and it works very well-lots of hp.

 

I have both the rb and the m2 and I prefer the looks of the rb but the m2 is a better build imo and better flow. I replaced an n1 single with the m2 and the boost didn't move so I would say the flow is very good there's not as much bend in the piping unlike the rb which is not as straight. Also the rb is a combo of pipe and exhaust which means easier install but also just another exhaust leak waiting to happen.

 

Honestly, I think the stock muffler would be too loud with full non-sequential. When you remove the TCA door it allows both exhaust ports to be heard.
I think that the M2 ehxaust is one of the quietest muffler out there for a stock FD.