Anybody running a 4" downpipe?
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Anybody running a 4" downpipe?
Has anybody modified their firewall to run a 4" superduty downpipe? If so do you have any pictures of what section was modded and how much?
I'm converting the '95 over to a SD turbo setup and will be running the 4" downpipe. Looking for pictures and guidience as to where to cut and how much to clearance. Will be doing it sometime this fall.
No need to talk me out of doing it cause it isn't needed and the 3" will be fine. I'll be running a larger turbo in the future and that's why I want the 4" dp now.
Thanks!
I'm converting the '95 over to a SD turbo setup and will be running the 4" downpipe. Looking for pictures and guidience as to where to cut and how much to clearance. Will be doing it sometime this fall.
No need to talk me out of doing it cause it isn't needed and the 3" will be fine. I'll be running a larger turbo in the future and that's why I want the 4" dp now.
Thanks!
Hotshot
Joined: Jul 2008
Posts: 11,231
Likes: 130
From: Thomasville, GA
Just look at the section where the stock pipe runs, find the seam on the firewall, take all your carpet out and cut the floor at that spot and weld in a channel for it to run along that line...
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Joined: Sep 2003
Posts: 2,630
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From: North East Ohio
I have my cab hammered in a LOT, AND have a 3" body lift and a 4" pipe still needs to be dimpled in at the cab.
ONLY way to make it work is to cut the floor out and weld in a piece of 5" pipe cut in half to make the hump.
But I will say it's not needed. Plenty of guys making 550 hp on a 3" downpipe...
ONLY way to make it work is to cut the floor out and weld in a piece of 5" pipe cut in half to make the hump.
But I will say it's not needed. Plenty of guys making 550 hp on a 3" downpipe...
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
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Joined: Sep 2003
Posts: 2,630
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From: North East Ohio
I'll also add that I tried to use a 4" SD down pipe when I mounted my 38R turbo. There was no way on God's green earth that the pipe was going to make the bend out of the turbo and go down the firewall, even with the 3" body lift and beat-in firewall. There's no way to get the 'cobra's head' of a 4" pipe to fit...
On my custom mounted turbos, I have the trubo mounted way to the driver's side and allows for more room for the turbo flange and elbow, but with the stock turbo, I don't see it happening. I would have made it fit if I thought it was possible even for my truck.
Best of luck to you.
On my custom mounted turbos, I have the trubo mounted way to the driver's side and allows for more room for the turbo flange and elbow, but with the stock turbo, I don't see it happening. I would have made it fit if I thought it was possible even for my truck.
Best of luck to you.
__________________
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
Elder User
Joined: Sep 2003
Posts: 892
Likes: 3
From: Quinton NJ
not to sound like a traitor... but there were a few guys over at psn who have done this. but it was with an h2e. they describe it as cutting where the new dp would be and tunneling sheet metal and pop riveting it in there. not my cup of tea. my used h2e kit came with a 4" dp and i refuse to do that. Im still waiting on hypermax to call me with prices
but there were a few guys over at psn who have done this. but it was with an h2e. they describe it as cutting where the new dp would be and tunneling sheet metal and pop riveting it in there. not my cup of tea. my used h2e kit came with a 4" dp and i refuse to do that. Im still waiting on hypermax to call me with prices
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Postmaster
Joined: Jan 2004
Posts: 3,207
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From: Kearney, Nebr
I have my cab hammered in a LOT, AND have a 3" body lift and a 4" pipe still needs to be dimpled in at the cab.
ONLY way to make it work is to cut the floor out and weld in a piece of 5" pipe cut in half to make the hump.
But I will say it's not needed. Plenty of guys making 550 hp on a 3" downpipe...
ONLY way to make it work is to cut the floor out and weld in a piece of 5" pipe cut in half to make the hump.
But I will say it's not needed. Plenty of guys making 550 hp on a 3" downpipe...
Do you have any pictures?
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Smokin'
Joined: Nov 2003
Posts: 539
Likes: 0
From: Aston
this is probably the best pic i have looking up from underneath.
looking up no dp 2 pictures from trucks photos on webshots
there's a lot of pounding, cutting, and reshaping of the firewall
looking up no dp 2 pictures from trucks photos on webshots
there's a lot of pounding, cutting, and reshaping of the firewall
Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
not to sound like a traitor... but there were a few guys over at psn who have done this. but it was with an h2e. they describe it as cutting where the new dp would be and tunneling sheet metal and pop riveting it in there. not my cup of tea. my used h2e kit came with a 4" dp and i refuse to do that. Im still waiting on hypermax to call me with prices
but there were a few guys over at psn who have done this. but it was with an h2e. they describe it as cutting where the new dp would be and tunneling sheet metal and pop riveting it in there. not my cup of tea. my used h2e kit came with a 4" dp and i refuse to do that. Im still waiting on hypermax to call me with pricesthis is probably the best pic i have looking up from underneath.
looking up no dp 2 pictures from trucks photos on webshots
there's a lot of pounding, cutting, and reshaping of the firewall
looking up no dp 2 pictures from trucks photos on webshots
there's a lot of pounding, cutting, and reshaping of the firewall