I6 300 exhaust help please!?
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I6 300 exhaust help please!?
I was wondering if I can run true duel flowmasters with no cats on my 1991 4.9 300 6. Im talking two flowmaster 40 series mufflers on it. Will it fool with my o2 sensor or not?
Thanks for the help
Thanks for the help
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Joined: Dec 2003
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From: Centerville, Iowa
I'll save the others the time here, and field this one.
The exhaust manifold (and all streetable headers for the engine) are a all-into-one design. It's not split up with two pipes joining someplace. It's all 6-to-1. So you can't have true duals, you can only Y-pipe it out. You'd be better off running 3" pipes back to a 3" SI/2.25" DO Flowmaster 40 and then having it dual out from there. NO reason to Y it off and spend 150+ dollars on a pair of FM40's. Honestly, the best exhaust for 300's is to run a single 2.75" or 3" all the way back with glasspacks or mufflers, whatever you want, on it. No reason to really dual it out. It will sound like it's supposed to this way as well...It will never have a V8 rumble you know.
The exhaust manifold (and all streetable headers for the engine) are a all-into-one design. It's not split up with two pipes joining someplace. It's all 6-to-1. So you can't have true duals, you can only Y-pipe it out. You'd be better off running 3" pipes back to a 3" SI/2.25" DO Flowmaster 40 and then having it dual out from there. NO reason to Y it off and spend 150+ dollars on a pair of FM40's. Honestly, the best exhaust for 300's is to run a single 2.75" or 3" all the way back with glasspacks or mufflers, whatever you want, on it. No reason to really dual it out. It will sound like it's supposed to this way as well...It will never have a V8 rumble you know.
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From: Centerville, Iowa
I have seen them as well, but I can't imagine them being very cost effective. Also, remember that the EFI manifold flows perfectly fine on these engines unless you've worked it over quite a bit. I have one ^_^
Also...firing order and header design owuld make me think that it'd be difficult to build a very efficient header for our truck.
Also, you have a pre-cat O2 sensor, so you won't mess up your system. Just remember not to go too big.
I think I'm just going to hack off my exhaust and put a turndown underneath it...not sure yet though. It's glasspacked right now with a bad exhaust leak on the air tube..so I dont' know. Another day, and another thread.
Also...firing order and header design owuld make me think that it'd be difficult to build a very efficient header for our truck.
Also, you have a pre-cat O2 sensor, so you won't mess up your system. Just remember not to go too big.
I think I'm just going to hack off my exhaust and put a turndown underneath it...not sure yet though. It's glasspacked right now with a bad exhaust leak on the air tube..so I dont' know. Another day, and another thread.
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Originally Posted by Saurian
I'll save the others the time here, and field this one.
The exhaust manifold (and all streetable headers for the engine) are a all-into-one design. It's not split up with two pipes joining someplace. It's all 6-to-1. So you can't have true duals, you can only Y-pipe it out. You'd be better off running 3" pipes back to a 3" SI/2.25" DO Flowmaster 40 and then having it dual out from there. NO reason to Y it off and spend 150+ dollars on a pair of FM40's. Honestly, the best exhaust for 300's is to run a single 2.75" or 3" all the way back with glasspacks or mufflers, whatever you want, on it. No reason to really dual it out. It will sound like it's supposed to this way as well...It will never have a V8 rumble you know.
The exhaust manifold (and all streetable headers for the engine) are a all-into-one design. It's not split up with two pipes joining someplace. It's all 6-to-1. So you can't have true duals, you can only Y-pipe it out. You'd be better off running 3" pipes back to a 3" SI/2.25" DO Flowmaster 40 and then having it dual out from there. NO reason to Y it off and spend 150+ dollars on a pair of FM40's. Honestly, the best exhaust for 300's is to run a single 2.75" or 3" all the way back with glasspacks or mufflers, whatever you want, on it. No reason to really dual it out. It will sound like it's supposed to this way as well...It will never have a V8 rumble you know.
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From: Centerville, Iowa
You're offline, so I can't talk to you like I did last night.
I was just going to say, I'm not sure how the 300 would sound with an X pipe or anything. I've never heard anybody put an X-pipe on anyways. Talk has always been replacing the "Y-pipe collector cat" as I call it with a Walker downipe and then running the exhaust from there.
Check out the firing order in your book for the 300 - another thought of mine also in regards to the header thing.
You did catch me though, I had forgotten about the Walker downpipe and the trucks that require it - yours in this case. As I mentioned to you, I was only going by what MY truck that I have outside has. Sorry bro. I'm off to go get some food (college...they only feed us Mon-thurs), if you get on again give me a ring.
I was just going to say, I'm not sure how the 300 would sound with an X pipe or anything. I've never heard anybody put an X-pipe on anyways. Talk has always been replacing the "Y-pipe collector cat" as I call it with a Walker downipe and then running the exhaust from there.
Check out the firing order in your book for the 300 - another thought of mine also in regards to the header thing.
You did catch me though, I had forgotten about the Walker downpipe and the trucks that require it - yours in this case. As I mentioned to you, I was only going by what MY truck that I have outside has. Sorry bro. I'm off to go get some food (college...they only feed us Mon-thurs), if you get on again give me a ring.
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Originally Posted by Saurian
You're offline, so I can't talk to you like I did last night.
I was just going to say, I'm not sure how the 300 would sound with an X pipe or anything. I've never heard anybody put an X-pipe on anyways. Talk has always been replacing the "Y-pipe collector cat" as I call it with a Walker downipe and then running the exhaust from there.
Check out the firing order in your book for the 300 - another thought of mine also in regards to the header thing.
You did catch me though, I had forgotten about the Walker downpipe and the trucks that require it - yours in this case. As I mentioned to you, I was only going by what MY truck that I have outside has. Sorry bro. I'm off to go get some food (college...they only feed us Mon-thurs), if you get on again give me a ring.
I was just going to say, I'm not sure how the 300 would sound with an X pipe or anything. I've never heard anybody put an X-pipe on anyways. Talk has always been replacing the "Y-pipe collector cat" as I call it with a Walker downipe and then running the exhaust from there.
Check out the firing order in your book for the 300 - another thought of mine also in regards to the header thing.
You did catch me though, I had forgotten about the Walker downpipe and the trucks that require it - yours in this case. As I mentioned to you, I was only going by what MY truck that I have outside has. Sorry bro. I'm off to go get some food (college...they only feed us Mon-thurs), if you get on again give me a ring.
Thanks for the help
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Laughing Gas
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From: Yuba City, Ca
i think if you have two manifold pipes you could. i thought they only had one but i guess i'm wrong. take it to a muffler shop and ask them about it and they should tell you that and what size duels to run. i'm thinking 2" i a lil big and i think duels would be waste on an inline motor. To Each HIs Own!!!
Drive It Like You Stole It!!!
Drive It Like You Stole It!!!
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Laughing Gas
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From: Yuba City, Ca
thereason i say it's a waste is because you could get better flow with a single pipe instead of two. i just explained this entire thing for another guy and i helped him out and he said it made sense why after i explained to him. here's the link: https://www.ford-trucks.com/forums/s...d.php?t=297574
hope this helps you figure out what i'm saying. it's all about velocity. you'll have to read the entire thread to understand.
Drive It Like You Stole It!!!
hope this helps you figure out what i'm saying. it's all about velocity. you'll have to read the entire thread to understand.
Drive It Like You Stole It!!!
Posting Guru
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From: Centerville, Iowa
Mine with just a glasspack (OLD glasspack....) and an exhaust leak to go with sounds like a tractor at times.
You'll never be able to get it to sound like a V8. It will always be missing "something" you know? Good thing is you'll DEFINATELY never get mistaken for a V6, either. My 302 got mistaken for a "really buff V6" the other day by a friend - I was ****ed. Anyways...
2" wouldn't be too big. 300 & 302 can go up to 2.25" duals with no to very little movement of the torque curve upwards. The 2" would probably be better, but I believe he (as well as myself) also want the sound advantage a 2.25" pipe will carry over the 2".
I personally am thinking about taking MY truck in and having a single 3" pipe run from the manifold to in front of the passenger rear tire with a glasspack on it...shouldn't be much more then 100 bucks.
Wickeymustang, do you have a link to any of the 3&3 headers on the net, by chance? I had thought that any headers like that were more of a race-item (like hte only head offered aftermarket for the 300....that can't even be run on the street...). Just curious, it has been awhile since I've looked at 300 stuff.
You'll never be able to get it to sound like a V8. It will always be missing "something" you know? Good thing is you'll DEFINATELY never get mistaken for a V6, either. My 302 got mistaken for a "really buff V6" the other day by a friend - I was ****ed. Anyways...
2" wouldn't be too big. 300 & 302 can go up to 2.25" duals with no to very little movement of the torque curve upwards. The 2" would probably be better, but I believe he (as well as myself) also want the sound advantage a 2.25" pipe will carry over the 2".
I personally am thinking about taking MY truck in and having a single 3" pipe run from the manifold to in front of the passenger rear tire with a glasspack on it...shouldn't be much more then 100 bucks.
Wickeymustang, do you have a link to any of the 3&3 headers on the net, by chance? I had thought that any headers like that were more of a race-item (like hte only head offered aftermarket for the 300....that can't even be run on the street...). Just curious, it has been awhile since I've looked at 300 stuff.
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From: Centerville, Iowa
Originally Posted by llostll65
So theres nobody out there that has run true duals on a 300?
Well is there atleast someone who has run singler in dual out with a 40 series flowmaster with no cats with a 300?
Thanks for the help
Well is there atleast someone who has run singler in dual out with a 40 series flowmaster with no cats with a 300?
Thanks for the help
Deep rumble is brought on by a good size tip...assuming you've got hte cubes to make the noise (done by the 300). Just don't expect a V8 roar...it'll be all its own
.
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Thank a lot Saurian. I definetly plan on getting 3.5" x 18" or 4" x 24" Tips. Does anybody here have the 24" Tips and do you know if it really makes that much of a deeper noise differance than the 18" Tips?
Thanks
Thanks