Cats or no Cats?
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New User
Joined: Nov 2006
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Cats or no Cats?
i have a 97 F-150 xlt 4x4...and within the next few months i'm installing Super 40 Series Flowmasters. my buddy just got his cats cut out with the reg. 40 series. I was wondering what yall thought if it would be worth it, or how would it sound? the reg. 40 series is nice, but too loud for me. i enjoy the deeper tone.
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Welcome to the forum
Well, it's illegal for 1 and they flow pretty good as is. I have a 40 series with the cats and it sounds great, but isn't too loud. You will also lose some low end torque if you remove the cats.
Well, it's illegal for 1 and they flow pretty good as is. I have a 40 series with the cats and it sounds great, but isn't too loud. You will also lose some low end torque if you remove the cats.
FTE Legend
Joined: Aug 2004
Posts: 37,887
Likes: 20
From: North Central Rural Sask.
I would remove them, gut them, or get some high flo cats at least. They do not have very good flow if they are stock ones. After you have them removed you will notice a huge sound difference. Like lx man said though, in some places, it is illegal to not run cats.
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
the reason he lost the milage is the computer goes into a default mode when the cats fail and they richen the fuel mixture to prevent emissions. this can be fixed with the o2 simulators. about $35 a piece online?? without the simulators, you will not only lose gas milage due to computer interaction, you will also have a constant MIL light on. Other engine operations could be affected as well.
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Posting Guru
Joined: Jul 2005
Posts: 1,940
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I would keep them, or at the least put some magnaflow cats on. I think in the end we all should do our part for the environment. The stock cats flow pretty good, the manifolds on these trucks suck so there really is no advantage in removing them other than extra $ spent. Going to a 3 inch cat-back system will improve it a bit but no real seat-of-your-pants feel, nice sound though.
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