The only way to use cats with longtubes is to have the cats welded in right behind the longtubes and some o2 sensor extension wires put in. However, if you're going with longtubes, you might as well eighty-six the cats or you won't be happy with your longtubes.
Lng tube headers
Is there any way to use long tube headers with stock cats (without offroad piping or high flow cats)? Can a shop cut in front of the cats for an install?
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