Quote:
Originally Posted by WYKDZL1
The inside diameter is very similar. It's not the same heat shield the K&N is carbon fiber and doesn't go all the way to the fender wall the roto fab boss much closer to the fender wall and also all the way to the front clip. The RF also leaves a mark in the dust on the hood so IMO it seals the engine heat out much better. The RF heat shield is a heavy gauge metal with perfect fitment against the frame. The K&N was very flimsy and held much more heat.
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Valid point there hadn't noticed the measurement differences till you pointed them out, Might just throw a rf filter on my k&n an see if there are any differences on dyno numbers.