early 1999
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
early 1999
I have a early 99 stock 7.3 except for cold air intake. I was thinking of opening the exhaust. Is it really necessary to go with a 4 or 5 inch exhaust or would removing the cat and adding a free flow muffler work almost as well? I really dont want to go without the muffler, I think that would be just too loud for me.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Just go with a 4" system, the 5" ones don't really give you anything more except a tone change. A CAT delete would help, but the muffler is also part of the restriction. Most aftermarket systems have a high flow muffler too.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
I have a early 99 stock 7.3 except for cold air intake. I was thinking of opening the exhaust. Is it really necessary to go with a 4 or 5 inch exhaust or would removing the cat and adding a free flow muffler work almost as well? I really dont want to go without the muffler, I think that would be just too loud for me.
Lead Driver
Joined: Mar 2004
Posts: 5,372
Likes: 108
From: Northern Indiana
Run my early 99 with cat and muffler delete. Apparently I was one of the lucky early 99 with a cat. It is loud when you get on it
. But I love the whistle sound.
My wife don't drive my truck very often, but when she does I make sure I have my head out the door to hear it drive away,love the way it sounds.
The only thing to watch with just with changing the muffler instead of a new exhaust is watch your egts, my has a dp but it climbs quickly to 1,100 when towing. So if you tow just keep an eye on that. Exhaust is my next mod.
. But I love the whistle sound. My wife don't drive my truck very often, but when she does I make sure I have my head out the door to hear it drive away,love the way it sounds.
The only thing to watch with just with changing the muffler instead of a new exhaust is watch your egts, my has a dp but it climbs quickly to 1,100 when towing. So if you tow just keep an eye on that. Exhaust is my next mod.
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
It sure looks like a cat but cant tell if it's hollow or not. Production date of 11/98. I would think that removing the cat (or fake cat) and opening up the stock muffler with a less restirctive one that it would lower EGT from stock. Is that not true? I do tow so do not want to increase EGT.
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
My e99 has a cat.. still got it..along with a straight muffler. I think Ford installed them on new trucks that were shipped to certain states that required cats.
But, i did have an old F150 ('85) with a bad cat and I could not hardly get up a hill, no power.. degutted it and solved the problem. The mat'l inside sometimes gets damaged and blocks the flow of exhaust.
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Laughing Gas
Joined: Aug 2003
Posts: 836
Likes: 9
Clogged or defective cat would be a good reason to remove a it. I wonder if you had a bad cat if your EGT would be higher than normal so you would know? Maybe someone removed the guts from your cat Leekingen and that is why it was hollow on the inside?
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Posting Guru
Joined: Feb 2004
Posts: 2,365
Likes: 0
From: IOWA
The cheapest way out is to remove the cat and muffler, it will help some with egts but not as much as a full 4" exhuast. The stock exhaust has a 3" downpipe. When going to a full 4" system, it'll drop egts 150*+, allow you to keep the power to it longer, etc.
I ran with a cat and muffler delete on my e99 for a while, it does sound a lot better, but a nice muffler is worth it, especially with a family.
How heavy do you tow? If you are stock everything else, and don't plan on increasing power... or at least anytime soon, I would go with the cat/muffler delete. Save up for a nice SS 4" when you get some tunes.
I ran with a cat and muffler delete on my e99 for a while, it does sound a lot better, but a nice muffler is worth it, especially with a family.
How heavy do you tow? If you are stock everything else, and don't plan on increasing power... or at least anytime soon, I would go with the cat/muffler delete. Save up for a nice SS 4" when you get some tunes.
Logistics Pro
Joined: Aug 2005
Posts: 3,884
Likes: 180
From: Morgan Hill, CA
Run my early 99 with cat and muffler delete. Apparently I was one of the lucky early 99 with a cat. It is loud when you get on it. But I love the whistle sound.
My wife don't drive my truck very often, but when she does I make sure I have my head out the door to hear it drive away,love the way it sounds.
The only thing to watch with just with changing the muffler instead of a new exhaust is watch your egts, my has a dp but it climbs quickly to 1,100 when towing. So if you tow just keep an eye on that. Exhaust is my next mod.
. But I love the whistle sound. My wife don't drive my truck very often, but when she does I make sure I have my head out the door to hear it drive away,love the way it sounds.
The only thing to watch with just with changing the muffler instead of a new exhaust is watch your egts, my has a dp but it climbs quickly to 1,100 when towing. So if you tow just keep an eye on that. Exhaust is my next mod.
Molon Labe
Joined: Dec 2006
Posts: 5,272
Likes: 1
From: Alaska
Someone like me prob gutted and reinstalled the cat. Both of my e99 had cats. One sold new in GA, the other in FL.?
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
If its legal in your state, remove the Cat. It will help. A 4 inch system with down pipe is a better way to go but nobody I know has any trouble doing what you want. Except during smog check.
Chet
Chet
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