Are these the straight thru hollow design cats that look like little mini mufflers -->Universal Off-Road Race MagnaFlow Catalytic Converters by Car Sound
or are they the actual spun metallic substrate honeycomb design? not the ceramic substrate? like these -->http://www.car-sound.com/02product/universal/599spun.asp
Thanks
or are they the actual spun metallic substrate honeycomb design? not the ceramic substrate? like these -->http://www.car-sound.com/02product/universal/599spun.asp
Thanks
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