Most of the exhaust shop around my area does not carry stainless wrap resonator, they all carry what they call 'Glass Pack'. From the outside they look identical, difference being one has a stainless wrapping on the inside to improve longevity and the other is just the packing material itself.
I had glass pack resonator installed before the Vibrant, they sounded really good (deep and smooth) but the packing burnt out after only six months or so due to the high temperature gas from the turbo.
Price is a good indicator as well, those glass pack is considerably cheaper.
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