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Since this is something that pops up time to time I thought I would post what I did to remedy the rotting resonator. The OE part seems destined to fail so I wanted to replace it with something better. I'm not going to say this is the best way to do it but merely what I did with reasonably priced and available materials. I started with a Magnaflow Y-pipe (http://www.magnaflow.com/products?partNumber=10748). Cheapest price I found was on Ebay, around $30. Unfortunately, the 2" inlets were not spaced like the OE Unit

https://goo.gl/photos/gL3qvozBen29nu3G9

I found a local muffler shop to bend me some 2" 409 stainless tubing for $40 to make up the offset. The biggest pain to trying to join the stainless tubing to the existing flange plate as it was really rusted and pitted. I spent some time cleaning it up and buttering the plate with E6013 wire to give a nice surface to mate the tubing. Another thing of note is that the OE pipes are probably metric while the replacement parts are imperial. I suppose I could have gone back to the muffler shop and had them swage the tubing to provide a better fit but since I had a 10# keg of E308 wire sitting around I lapped the tubing and did a lot of buttering. The finished product:

https://goo.gl/photos/2d9txeCFDaxmh3t1A

Upon firing the car up, I realized that all that welding on the flange plate had caused it to cup slightly, causing an exhaust leak. I ended up replacing the thin stainless gasket with a paper one (http://www.amazon.com/gp/product/B0...ket exhaust&qid=1447596305&ref_=sr_1_1&sr=8-1) and some high temp sealant. While I was under there I also replaced the flange plate bolts with stainless ones as they were in rough shape. Total cost ended up being around $90. More importantly, it should provide a much longer life than the flawed original design. As for sound levels, it has slightly more growl, most noticeable at idle but only if you have everything turned off and pay particular attention. Punching the accelerator gives a pleasant sound, less wheezy than before. If anybody cares I can post video with sound doing a before / after. Hopefully this is useful to someone out there as I'm sure there are many 3.2 owners in places with heavily salted roads going through this as well.

EDIT: Embedding photos doesn't seem to be working?
 

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As for sound levels, it has slightly more growl, most noticeable at idle but only if you have everything turned off and pay particular attention. Punching the accelerator gives a pleasant sound, less wheezy than before. If anybody cares I can post video with sound doing a before / after. Hopefully this is useful to someone out there as I'm sure there are many 3.2 owners in places with heavily salted roads going through this as well.
Some of us near the coast will like this as well. I just purchased a 2010 and I believe it has this same issue. Every car I test-drove had an odd wheezy sound as you call it during acceleration. This must be what causes that as it sounds like an exhaust leak.
 
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