exhaust drone/harmonic resonance

Hi Mike, the good thing is Walker has been using the CRF acoustic material for 15 or more years now. It is very hard to get it to blow out and in fact, in most cases, where a car is driven a few thousand miles per years, it will not blow out. And with Walker being such a large company, they are very good about taking care of issues with mufflers, even ones with springs or valves.

The VT technology is actually production OEM stuff in Europe and Asia so it is going to be tested a lot harder than most of us ever will with our "drive now and then cars". But, I can understand concern with valves and springs in mufflers :):).

Take care and thanks for the comments.
Tom