so 5" may be overkill. 
5" downpipe
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Senior User
Joined: Nov 2008
Posts: 306
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From: simi valley
5" downpipe
im curious to know if anyone has any info on a 5" downpipe for my 2000 7.3l. i have searched and called and searched for one and everytime someone says "turbo back full 5" they mean 4" downpipe and 5" the rest.basically im looking for a 5" straight pipe out before my tire.looking to spend under 300 for it too.so any help would be greatly appreciated
Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
The only way to get a 5" downpipe is to have one custom made. And then you'd have to modify the firewall to get it to fit. You'd have WAY over $300 invested.
As others have said, the outlet of the turbo is not even 4". The flange/opening is smaller and right past the flange it expands to 4". If you're wanting a 5" system, then just go with a standard kit w/ 4" dp.
As others have said, the outlet of the turbo is not even 4". The flange/opening is smaller and right past the flange it expands to 4". If you're wanting a 5" system, then just go with a standard kit w/ 4" dp.
Farkall User
Joined: Mar 2010
Posts: 800
Likes: 1
From: Slade Point, Australia
I wonder if somebody makes a actual 4" dump pipe for the 7.3 garret turbo????,i went seen a bloke at www.rocketsportstrucks.com.au/ and he said to get a 4" pipe from my turbo down past the firewall they would have to use a portapower to pop the firewall bulge back the other way to fit it thru,he said he's done it on many trucks.... crikey! so thats just to get 4" past,i'd hate try and get 5" down thru there LOL...
But what a burble she'd have with 5" all the way hehehheh.
But what a burble she'd have with 5" all the way hehehheh.
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Senior User
Joined: Nov 2008
Posts: 306
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From: simi valley
thanks guys.most of my buddys ran the 4" and said it fit in there fine.but one guy ran a 5" and had to dent in the firewall.i guess ill just be sticking with the 4" to 5" and run that.thanks for all the replys
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Senior User
Joined: Nov 2008
Posts: 306
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From: simi valley
??what??
anyone have an recommendations on where to get the cheapest kit? i found a turbo back 4" downpipe and 5" rest for 310 shipped.can i get it cheaper or is that a good deal?
anyone have an recommendations on where to get the cheapest kit? i found a turbo back 4" downpipe and 5" rest for 310 shipped.can i get it cheaper or is that a good deal?
Farkall User
Joined: Mar 2010
Posts: 800
Likes: 1
From: Slade Point, Australia
ROFLMAO its wot us aussie's call another man,you guys call one another, guys /fellas/ we just added bloke to the list...hehehheh aussie thing 
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Senior User
Joined: Nov 2008
Posts: 306
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From: simi valley
i ordered the full stainless steel kit with 4" downpipe and 5" straight for the rest.now im going to just have to cut and weld to get it to come out before my tire.thanks for the help everyone
Postmaster
Joined: Jul 2006
Posts: 4,993
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From: Bend, OR
LOL... I'll believe a 5" down pipe when I see it...
More Turbo
Joined: Jan 2010
Posts: 680
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From: Las Vegas, Nevada
Cool. I'll have to start using that one.
Logistics Pro
Joined: Jul 2009
Posts: 3,635
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From: Lansdale, PA
Mate would be a friend, or in a friendly manner.
Bloke would be a person you were making fun of, or possibly a friend.
"no worries, mate"
"that poor bloke punctured his tyre on some rocks navigating around the washout"
that's my translation lol.
I've always wanted a full 5" turbo back , but never found one. I was going to build one but the 4" fit so well, and like Joe said, it's more then enough flow for any reasonable hp goal.
Bloke would be a person you were making fun of, or possibly a friend.
"no worries, mate"
"that poor bloke punctured his tyre on some rocks navigating around the washout"
that's my translation lol.
I've always wanted a full 5" turbo back , but never found one. I was going to build one but the 4" fit so well, and like Joe said, it's more then enough flow for any reasonable hp goal.