MPG after cat removal?
Thread Starter
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Senior User
Joined: Nov 2001
Posts: 275
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From: Warner Robins, GA
MPG after cat removal?
Two quick questions for you experts:
1. Did I dream this or did I actually see a couple posts where folks MPG actually dropped after removing a rear cat? I don't really see how it could, but then again we're dealing with computers and sensors and such...
2. Are shorty headers worth the time/money/effort? My 93 F-150 302 E4OD does mostly basic transportation duty, mild to moderate 4-wheeling , and occasional towing of a 1500 lbs. boat. I already have a Flowmaster cat-back system. Would the shorters give me anything I ain't already got?
Thanks
1. Did I dream this or did I actually see a couple posts where folks MPG actually dropped after removing a rear cat? I don't really see how it could, but then again we're dealing with computers and sensors and such...
2. Are shorty headers worth the time/money/effort? My 93 F-150 302 E4OD does mostly basic transportation duty, mild to moderate 4-wheeling , and occasional towing of a 1500 lbs. boat. I already have a Flowmaster cat-back system. Would the shorters give me anything I ain't already got?
Thanks
Elder User
Joined: Jun 2001
Posts: 997
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From: Corydon US of A
MPG after cat removal?
1. I've never seen anyones MPG go down after taking of the cats. but then again i guess anything can happen
2. I guess it really depends how much you want those 10-15 HP, remember HP, not torque, but as for installing them i never thought it was all that bad of deal pretty easy to get in there, and of corse there about 10x easier than full length headers.
hope this helped
Dave
1979 F-250 4x4 351M "Red Line"
2. I guess it really depends how much you want those 10-15 HP, remember HP, not torque, but as for installing them i never thought it was all that bad of deal pretty easy to get in there, and of corse there about 10x easier than full length headers.
hope this helped
Dave
1979 F-250 4x4 351M "Red Line"
Thread Starter
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Senior User
Joined: Nov 2001
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From: Warner Robins, GA
MPG after cat removal?
Thanks Cowboy...(1) reason I asked is that after removing my cat...it seems like my MPG went down. I say "seems" because it's tough to do a good MPG check on a small island. I fully intend to put a free-flow cat on in the spring, just hollowed this one out to see what the difference would be. Did notice a nominal performance gain though.
(2) I read in a 4X4 mag that shorty headers didn't provide the bang for the buck...especially at low-to-midling RPMS. A local drag-racing guru that seems to know his stuff pretty much confirmed that. The only reason I was considering shorties is so that I would not have to re-engineer my whole exhaust system. Not that big a deal I know, but it would involve going back to the exhaust shop vs. doing it all my self. Thanks for the input though!!
(2) I read in a 4X4 mag that shorty headers didn't provide the bang for the buck...especially at low-to-midling RPMS. A local drag-racing guru that seems to know his stuff pretty much confirmed that. The only reason I was considering shorties is so that I would not have to re-engineer my whole exhaust system. Not that big a deal I know, but it would involve going back to the exhaust shop vs. doing it all my self. Thanks for the input though!!
