JOV
Well-known member
Has anyone that has the pre-cats or pup-cat on their C5 gutted them and notice any hp gain or performance or emmission related problems ?? Looking into those cats makes me wonder how the exhaust gasses can even go thru them , It looks very restrictive. My Y2K
C5 has 4 total, 2 just below the exhaust manifold and the 2 main cats down stream just before the H pipe :bang Here in Calif they inspect to make sure that the cats are in place but they would never know if the pup-cats were gutted
C5 has 4 total, 2 just below the exhaust manifold and the 2 main cats down stream just before the H pipe :bang Here in Calif they inspect to make sure that the cats are in place but they would never know if the pup-cats were gutted