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If you have a K&N drop in inside the stock air box, then just remove the tube and "Hemi Hat" and replace with $5 worth of PVC and a $8 boot. Will net you about the same results as doing a full CAI...
id go with a 2" personally, i dont think youd notice much of a difference with a 1.5
To be honest, I wanted to go 1.5" because I don't want to put any unwanted pressure on the cv joints, or anything that would cause problems down the road. If a 2" won't cause me any major or annoying issues I'll definitely consider it.
If you have a K&N drop in inside the stock air box, then just remove the tube and "Hemi Hat" and replace with $5 worth of PVC and a $8 boot. Will net you about the same results as doing a full CAI...