JDM DC5R variable bypass 'valve' exhaust pictures

[mugsee]

Taken fron Honda-tech:

http://www.honda-tech.com/zerothread?id=1025325

So I've been hearing that the DC5 ITR muffler has some type of bypass flap that opens under a certain rpm (or exhaust flow) to go from a fully chambered design to more or less, a straight thru (or at least less muffled) type. I thought that sounded pretty damn trick, so I picked one up, hacked off the inlet piping and here it is.

[air23box]

The design is pretty much same as mugen twinloop......seen this in hyper rev some time ago...