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Only one i've heard of such. IIRC there were posts about PTuning's one, that they had at some time possible plans of developing own oem-look-alike heatshield .. but i guess it never resulted in actual product. That's it. So for others .. about the only idea that crosses my mind is to have them dark ceramic coated to look not shiny/clearly aftermarket ones .. or go for Perrin 3" catback and leave header & frontpipe with cats intact to go for 100% legal setup in all the states. Yes, that 3" one will be too loud together aftermarket catless header, but with stock one it should be noise-wise on par with 2.5" unresonated one, and together with tune bring most gains not touching both stock cats.
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