3.5" Down Pipe
Lead Driver
Joined: May 2007
Posts: 8,607
Likes: 13
From: Belair md
3.5 is a good size, slightly harder to fit then the 3 inch but the 3.5 i beleive is the output size of the turbo so it would be the ideal one. my opinion, if you are going to cram the 3.5 in there then buy the 4 inch and go all out!
3 inch pipe- Beans Diesel Performance - 94-97 7.3L Power Stroke MBRP 3" Down pipe (does not fit cat) (Powered by CubeCart)
3.5- still looking
4 inch- Beans Diesel Performance - 99-03 7.3L Power Stroke MBRP 4" Down Pipe (Powered by CubeCart)
3 inch pipe- Beans Diesel Performance - 94-97 7.3L Power Stroke MBRP 3" Down pipe (does not fit cat) (Powered by CubeCart)
3.5- still looking
4 inch- Beans Diesel Performance - 99-03 7.3L Power Stroke MBRP 4" Down Pipe (Powered by CubeCart)
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
I think 3 inch is the ideal size to be honest.The Super duty guys have the option of 3 , 3.5 and 4. Most of them stick with 3.5 but those that go straight to 4 inch complain of a power loss. In reality there isn't a power loss but your power band moves up a few hundred RPM so you "lose" low end torque. Unless your pushing over 500HP I don't think there is a need nor a benefit for anything bigger than 3 inch.
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Logistics Pro
Joined: Oct 2008
Posts: 4,818
Likes: 1
From: Avilla, IN
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Elder User
Joined: Sep 2003
Posts: 892
Likes: 3
From: Quinton NJ
3.5 is a good size, slightly harder to fit then the 3 inch but the 3.5 i beleive is the output size of the turbo so it would be the ideal one. my opinion, if you are going to cram the 3.5 in there then buy the 4 inch and go all out!
3 inch pipe- Beans Diesel Performance - 94-97 7.3L Power Stroke MBRP 3" Down pipe (does not fit cat) (Powered by CubeCart)
3.5- still looking
4 inch- Beans Diesel Performance - 99-03 7.3L Power Stroke MBRP 4" Down Pipe (Powered by CubeCart)
3 inch pipe- Beans Diesel Performance - 94-97 7.3L Power Stroke MBRP 3" Down pipe (does not fit cat) (Powered by CubeCart)
3.5- still looking
4 inch- Beans Diesel Performance - 99-03 7.3L Power Stroke MBRP 4" Down Pipe (Powered by CubeCart)
IIRC dale isley over at tymar performance has all 3 sizes with the option of ceramic coating. you just have to call for prices.
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
I think 3 inch is the ideal size to be honest.The Super duty guys have the option of 3 , 3.5 and 4. Most of them stick with 3.5 but those that go straight to 4 inch complain of a power loss. In reality there isn't a power loss but your power band moves up a few hundred RPM so you "lose" low end torque. Unless your pushing over 500HP I don't think there is a need nor a benefit for anything bigger than 3 inch.
My tailpipe is 3 1/2.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
I think the Tymar 3 to 3.5 to 4 inch DP is a good option for get a big pipe in there but and using a straight 3.5 DP you may not notice any change but if you go up to the 4 inch you will notice the power band moving. I have not tried nor experienced it in someone elses truck I am just going off the reactions of Super duty owners so take that for what its worth. I have a turbo project in the works with a turbo that has a 5 inch outlet. It will be using a 3 inch DP.
Lead Driver
Joined: May 2007
Posts: 8,607
Likes: 13
From: Belair md
all of my schooling says that you need to match your outlet sizes. if the turbo outlet is 3 inch then use a 3 inch pipe, if the turbo outlet is 3.5 inch then use 3.5 inch... i would LOVE to see the 5 inch outlet.
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