Dynomax's new VT series - anyone tried variable valve set ups?

[s_ribs]

http://www.summitracing.com/parts/WLK-17155/

On my old E36 M3 I had a Dynomax race muffler on it and loved it. With my '91 318i I want something with reasonable volume and as little drone as possible, so this intrigues me.

I know later model BMW's come stock with a variable valve set up to reduce droning. Also recall how effective Ferrari's adjustable valve set up was on the F430 - very reasonable volume until the pedal went all the way down, then the fun began. Biggest difference is in how the valve opens. Not sure, but I believe the F430 valve adjustment may have been throttle based. This Dynomax unit is exhaust flow based.

Anyone have experience with variable valves in aftermarket mufflers? If not I'm tempted to be the guinea pig and just try it. This is a new muffler from Dynomax but the technology isn't new.

[CorvallisBMW]

cool idea. I wonder if they make a dual in/dual out version.

[s_ribs]

Definitely a cool idea.

Selection is pretty slim right now since they just released it.

http://www.dynomax.com/mufflers.php?muffler=vt

[ieatpeople]

i am looking for a quieter exhaust for one of my cars, this might be just the thing.

[CorvallisBMW]

This would be perfect for the upcoming m30 swap, nice and quiet at cruise then a beast when I want it to be :)

[s_ribs]

Just called Summit to check on availability. Summit doesn't have them, but they are in stock at Dynomax so they would drop ship from them. ~1.5 weeks to get one.

Still thinking...

If I don't try this one I'm likely to get this Magnaflow:

http://www.summitracing.com/parts/MPE-14814/