Tony Camonte asked:
If I removed the cat on my ’78 Grand Prix, how much better gas mileage (and power) would I get? I understand that the early catalytic converters were big and clunky and robbed a lot of power. Right now I get about 21 mpg highway and 105 hp with a 3.8l 231cc V6. I live in Wyoming so smog tests are not a big concern.
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Sphere: Related ContentIf I removed the cat on my ’78 Grand Prix, how much better gas mileage (and power) would I get? I understand that the early catalytic converters were big and clunky and robbed a lot of power. Right now I get about 21 mpg highway and 105 hp with a 3.8l 231cc V6. I live in Wyoming so smog tests are not a big concern.
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I must tell you that you are not supposed to remove the catalytic converter.
That being said, If the converter is in good working order, it does very little to restrict exhaust flow. The newer cats are even more free flowing than the older ones.
21 mpg is quite respectable for such an old car. If you want better mileage, buy a smaller car that is newer.