high flow cat?
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New User
Joined: Jan 2003
Posts: 3
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From: olympia
high flow cat?
hey guys 
new to the forum here,i had a couple of questions.i have been considering pulling my pre heater/cat section out and replacing it with a high flow cat.have any of you guys done this?i would assume it would raise my powerband somewhat,i dont know if its worth doing or not,but i am a bit concerned about the high millage on my cat right now,and it beeing to much of a restriction.i'm running a 92' 4.0 in my 89 truck,mild cam,headers and flowmaster exhaust.also,did you expeirience any big exhaust sound volume changes switching over?thanks very much.
2nd,how does one search the forum databases?i'm sure this has all been discused before,but i could not locate a search feature for all the forums.thanks again!
new to the forum here,i had a couple of questions.i have been considering pulling my pre heater/cat section out and replacing it with a high flow cat.have any of you guys done this?i would assume it would raise my powerband somewhat,i dont know if its worth doing or not,but i am a bit concerned about the high millage on my cat right now,and it beeing to much of a restriction.i'm running a 92' 4.0 in my 89 truck,mild cam,headers and flowmaster exhaust.also,did you expeirience any big exhaust sound volume changes switching over?thanks very much.2nd,how does one search the forum databases?i'm sure this has all been discused before,but i could not locate a search feature for all the forums.thanks again!
Cargo Master
Joined: Feb 2002
Posts: 2,414
Likes: 22
From: Tucson USA
high flow cat?
I have 94 4.0 5 speed 2wd. Just installed high flow cat, free flow muffler and 2.5 inch exhaust all the way from exhaust header to tail pipe. Truck has 98000 on it and it made a significant difference with just the exhaust. pulls easier in all gears, dont have to downshift as much. Gas milage went up but I also just installed new plugs. This was not a straight thru muffler its a magnaflow center in and out. Good mellow sound.
I will be installing a air intake from streetsmart designs next week.
I will be installing a air intake from streetsmart designs next week.
New User
Joined: Jan 2003
Posts: 4
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From: WILMINGTON USA
high flow cat?
COHO Hi I'm new to this vast wealth of info.and I think itis amazing. I have a 94 3.0 ranger 5speed 4x4. and I was hoping some one could help me determine which Magna Flow muffler will work on my truck.I want to go with 2.5 pipes and a Magna Flow because it is straight thru design, and I need some more power. If all the mufflers are the same on the inside , is it a matter of getting the same size as your original or someother formula? Any suggestions will be greatly apprciated. Thanks
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
high flow cat?
I wouldn't go any bigger than 2.5 for a single, I would prefer 2.25, 1.75-2.0 for a dual exhaust. If you go any bigger on a small V-6 it will end up hurting the exhaust flow. The mufflers are really only going to affect the sound when you get into performance ones.
New User
Joined: Jan 2003
Posts: 4
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From: WILMINGTON USA
high flow cat?
I plan to go with a single pipe, but is a straight thru muffler like Magna Flow too much, or would it be better for exhaust flow and power to use a Flow Master 40 for this little v-6? Also, I have 2 cats on my truck, if I decide to replace them do I need to replace both or can I use one performance cat legally and will it give me more power?Thanks for yhe help
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
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New User
Joined: Jan 2003
Posts: 4
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From: WILMINGTON USA
high flow cat?
What should I do about the cats? Can I get away with one cat legally and emission wise, or do I need to replace both of them?
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Cargo Master
Joined: Feb 2002
Posts: 2,414
Likes: 22
From: Tucson USA
high flow cat?
Coors1 you can replace the 2 piece cat with a high flow single. Biggest problem is the fitting the cat to the exhaust headers, on mine they were oval and the guy had to do some metal fabbing to get it lined up and hooked up. He told me the cats are th biggest constrictors, they start out at about 2.5 in and neck down to 2 inch at the muffler. I went with a magnaflow that has baffles, not as noisy as the one packed with sainless steel. Guy said it holds up better and is not as noisy. It is pretty mellow not as high pitched as the little cars with their high noise mufflers.
Posting Guru
Joined: Jul 2002
Posts: 2,205
Likes: 1
From: Vancouver WA
high flow cat?
Replacing the 2 cat setup with one is not legal where I live. I had to have some work done on my Bronco a year or so ago. The guy at the muffler shop told me that by state law (Washington), if a vehicle comes in with 2 cats, it has to leave with 2 cats. In my case, my Bronco only had 1 when I went in, so I was able to just install 1 high-flow cat and be done. If you live in an area where emission testing is done, especially if they do a visual as well, be sure to check out the rules regarding cat replacement. It would be a shame to spend a lot of money on a fancy exhaust system and then fail inspection on a technicality.
Senior User
Joined: Dec 2002
Posts: 330
Likes: 1
From: W-S
high flow cat?
It's my understanding that the rangers don't have two cats. They have a "preheater" and a cat. But all those rules n regs are open to interpitation. You can go to one place and they fail it, go across the street and it passes with flying colors. The only thing that should matter is what comes out the pipe, not how it got there.
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