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I went ahead and bastardized my RMM dp 12 months ago with a hi-flo cat. About 2 weeks ago on cold startups there is a rattling noise coming from the passenger side and once the car is fully warmed up the noise completely dissappear.
Put the car up on stands and lightly tapped the DP with my fist and the damm cat was making the exact same rattling sound. Ask a muffler about the noise and they said that a "ceramic biscuit" could have broken inside the cat that is what is causing the rattling noise and once the car is fully warmed up it expands and stops making the noise. Called up the cat manufacturer and they confirmed that the "ceramic biscuit" could break if the car is running rich. They explained the a rich fuel mixture could easily elevate the temps. inside the
cat to above normal causing it to "burn up", weaking whatever is inside causing it to break.
Anyone with a hi-flo cat a year or older have any problems?
I currently don't have a fuel controller, which is probably my next mod.
Put the car up on stands and lightly tapped the DP with my fist and the damm cat was making the exact same rattling sound. Ask a muffler about the noise and they said that a "ceramic biscuit" could have broken inside the cat that is what is causing the rattling noise and once the car is fully warmed up it expands and stops making the noise. Called up the cat manufacturer and they confirmed that the "ceramic biscuit" could break if the car is running rich. They explained the a rich fuel mixture could easily elevate the temps. inside the
cat to above normal causing it to "burn up", weaking whatever is inside causing it to break.
Anyone with a hi-flo cat a year or older have any problems?
I currently don't have a fuel controller, which is probably my next mod.