You have enough pressure. Cadillac Fleetwood catalytic converters shouldn't be contributing to that. In fact, your Fleetwood catalytic converter should be relieving some of that pressure so when you're cruising around from one errand to another, you have the best air flow possible.
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But, don't worry, even a high performance Fleetwood cat converter will do its number one job duty, which is to remove as many harmful toxins from the exhaust before reaching the air as possible. AutoAnything has Cadillac Fleetwood catalytic converters for California Emissions laws and those for the other 49 and beyond.
Year Range For Cadillac Fleetwood Catalytic Converters