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Originally Posted by ck-GT86
Do you have one of these to make that statement? They practically weigh nothing, the included toolset in your trunk weighs more than diffuser.
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True, but I don't drive around with that tool set (when it matters).
The diffusers still adds about the same weight than what the lightest legal cat-back does substract.
Glass filled epoxy laminate sheets could be a lighter, affordable alternative, but I'm not sure whether the heat radiation of the muffler would be a problem. (The guide vanes could be used to shape it, since this is not a material that can be formed cold as sheet metal can.)
I can see that most people would probably prefer a diffuser out of (thicker) aluminum sheet metal.