How does one unclog catalytic converters most easily?

[mpj76]

Did you remember to remove the SPOUT connector before setting base timing? If you don't, your changes won't hold. I have mine set at 14 degrees. If I put anything lower than 92 in my car, it pings. Removing the SPOUT severs the computer link during timing changes. Most cars running 93 octane can be bumped up to 14 degrees before they start to ping.