1990 7.3 exaust question
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1990 7.3 exaust question
Hi everyone! I am redoing the exaust system on my 1990 f-350 5 speed and am looking for some suggestions. The truck came with duel exaust (2" pipes) from the manifolds which ran thru 18" glasspacks. Loud isnt the word. I want to keep the duel exaust but was wondering what type of mufflers to go with? I also wanted to decrease back pressure to improve mpg. (currently getting 15-17mpg) would 2 1/2" pipes be sufficient or would I have to go larger? also when I haul a trailer I loose power going up the slightest hills and was told it was due to the 2" pipes.
Any suggestions would be greatly appreciated
Any suggestions would be greatly appreciated
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
1990 7.3 exaust question
2.5" should be ok, 3" would be better. To quiet it down some use longer mufflers. Swap the 18" out for something in the 24"-36" range, or go to a baffled muffler.
Senior User
Joined: Feb 2003
Posts: 253
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From: Waterbury, CT.
1990 7.3 exaust question
My partner put a flowmaster 3"in/out in his diesel. That sound it makes a little hard to describe. Loud would be a good start. Handful of lugnuts in the crankcase would be my second choice.
I think he thought it was going to sound like his mustang. I think not...
I think he thought it was going to sound like his mustang. I think not...
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1990 7.3 exaust question
that dosnt sound good
with the glasspacks it was loud but sounded like a Harley fatboy with headers which wasn't bad but I haul horses and it just seemed a little to loud. I went to a muffler shop and they said the flowmasters would quiet it down some but I dont want it to sound like crap either.
don't know what I'm gonna do? maybe I'll just replace the system with longer glasspacks.
Thanks for the info and any more suggestions would be greatly appreciated!!
1990 Ford f-350 duelly custom Crewcab "Hamilton Hauler"7.3 IDI
5Speed
with the glasspacks it was loud but sounded like a Harley fatboy with headers which wasn't bad but I haul horses and it just seemed a little to loud. I went to a muffler shop and they said the flowmasters would quiet it down some but I dont want it to sound like crap either. don't know what I'm gonna do? maybe I'll just replace the system with longer glasspacks.
Thanks for the info and any more suggestions would be greatly appreciated!!
1990 Ford f-350 duelly custom Crewcab "Hamilton Hauler"7.3 IDI
5Speed
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Joined: Jan 2003
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From: Post Falls, Idaho USA
1990 7.3 exaust question
Best suggestion is to add a turbo, 3" downpipe, 4" strait pipe exhaust! Unless you still want to buy feed for the "other" horses. 
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FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
1990 7.3 exaust question
Thats what I'm gonna do- 3" pipes and 24" glasspacks
