DOWNPIPE???????
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Elder User
Joined: Aug 2002
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From: South of you
DOWNPIPE???????
Can I add a 3.5" downpipe and keep the stock exhaust? Do you still get the same results....lower egt's or does this just defeat the purpose? I want to retain the stock exhaust if possible, but want the larger down pipe. Any help, ideas, anything????
Postmaster
Joined: Feb 2002
Posts: 2,773
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From: Bonney Lake, WA
DOWNPIPE???????
It would be like putting headers on a gasser, but keeping the stock exhaust system. There is an improvement, but not as much as if you replaced the whole thing, and removed the catalytic convertor at the same time.
Quadzilla
'95 F-350XLT Crew Cab SRW 4X4 PSD, 35X12.50X16.5's, Limited slip 4.10's, Hypermax downpipe, gutted EBPV, "Catless" in Seattle, "Renegade" 4" exhaust system, CTFD sticker, Air bags on all four corners, TYMAR intake, shimmed fpr, Diablo Delta chip, Fumoto valve, Autometer pyrometer, Sonnax valve, Tricumulator springs, Tru-Cool, HX mod, Magnefine tranny filter,
4R100 pan, Red Line synthetic in transfer case and both diffs, reverse shackle kit.
And a wish list that gets longer every day.
(Thank God for a wife that likes big trucks.)
For pictures, click here: http://community.webshots.com/user/quadzilla100
Quadzilla
'95 F-350XLT Crew Cab SRW 4X4 PSD, 35X12.50X16.5's, Limited slip 4.10's, Hypermax downpipe, gutted EBPV, "Catless" in Seattle, "Renegade" 4" exhaust system, CTFD sticker, Air bags on all four corners, TYMAR intake, shimmed fpr, Diablo Delta chip, Fumoto valve, Autometer pyrometer, Sonnax valve, Tricumulator springs, Tru-Cool, HX mod, Magnefine tranny filter,
4R100 pan, Red Line synthetic in transfer case and both diffs, reverse shackle kit.
And a wish list that gets longer every day.
(Thank God for a wife that likes big trucks.)
For pictures, click here: http://community.webshots.com/user/quadzilla100
Thread Starter
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Elder User
Joined: Aug 2002
Posts: 656
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From: South of you
DOWNPIPE???????
>I may be wrong and if I am someone please correct me but I
>think that your downpipe is already a 3.5 incher.
>
>Scott
It could be. I haven't measured it yet. I guess this means I will be looking at a 4". My main reason is to lower egt's with my SCMT on the 80hp setting. I assume that after the heat disperses through the down pipe, the gasses should?? be noemal by the time they hit the rest of the plumbing....how close to being wrong am I?????
>think that your downpipe is already a 3.5 incher.
>
>Scott
It could be. I haven't measured it yet. I guess this means I will be looking at a 4". My main reason is to lower egt's with my SCMT on the 80hp setting. I assume that after the heat disperses through the down pipe, the gasses should?? be noemal by the time they hit the rest of the plumbing....how close to being wrong am I?????
Thread Starter
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Elder User
Joined: Aug 2002
Posts: 656
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From: South of you
DOWNPIPE???????
>It would be like putting headers on a gasser, but keeping
>the stock exhaust system. There is an improvement, but not
>as much as if you replaced the whole thing, and removed the
>catalytic convertor at the same time.
>
>Quadzilla
>'95 F-350XLT Crew Cab SRW 4X4 PSD, 35X12.50X16.5's, Limited
>slip 4.10's, Hypermax downpipe, gutted EBPV, "Catless" in
>Seattle, "Renegade" 4" exhaust system, CTFD sticker, Air
>bags on all four corners, TYMAR intake, shimmed fpr, Diablo
>Delta chip, Fumoto valve, Autometer pyrometer, Sonnax valve,
>Tricumulator springs, Tru-Cool, HX mod, Magnefine tranny
>filter,
>4R100 pan, Red Line synthetic in transfer case and both
>diffs, reverse shackle kit.
>And a wish list that gets longer every day.
>(Thank God for a wife that likes big trucks.)
>For pictures, click here:
>http://community.webshots.com/user/quadzilla100
Quadzilla, I know your wish list is getting longer, but it seems to me that the mods already completed gets longer too!!!! Sounds like a bad PSD to me
>the stock exhaust system. There is an improvement, but not
>as much as if you replaced the whole thing, and removed the
>catalytic convertor at the same time.
>
>Quadzilla
>'95 F-350XLT Crew Cab SRW 4X4 PSD, 35X12.50X16.5's, Limited
>slip 4.10's, Hypermax downpipe, gutted EBPV, "Catless" in
>Seattle, "Renegade" 4" exhaust system, CTFD sticker, Air
>bags on all four corners, TYMAR intake, shimmed fpr, Diablo
>Delta chip, Fumoto valve, Autometer pyrometer, Sonnax valve,
>Tricumulator springs, Tru-Cool, HX mod, Magnefine tranny
>filter,
>4R100 pan, Red Line synthetic in transfer case and both
>diffs, reverse shackle kit.
>And a wish list that gets longer every day.
>(Thank God for a wife that likes big trucks.)
>For pictures, click here:
>http://community.webshots.com/user/quadzilla100
Quadzilla, I know your wish list is getting longer, but it seems to me that the mods already completed gets longer too!!!! Sounds like a bad PSD to me
Elder User
Joined: Aug 2002
Posts: 772
Likes: 0
From: Salem USA
DOWNPIPE???????
It may be that the stock downpipe is 3.5" but look at the shape, the thing is almost flattened, not sure why they thought they had to pancake the thing so bad from the factory. I replaced mine with a 3.5" downpipe I got off this site and it was perfectly round, made a noticeable difference.
Freshman User
Joined: Jan 2002
Posts: 36
Likes: 0
DOWNPIPE???????
I replaced mine with a 3.5" downpipe I got off
>this site and it was perfectly round, made a noticeable
>difference.
Is a non-flattened downpipe just a bolt-on installation or do I have to start cutting and bending things to get clearance? My '97 F250 doesn't have a lot of room between the engine and firewall.
rplett
>this site and it was perfectly round, made a noticeable
>difference.
Is a non-flattened downpipe just a bolt-on installation or do I have to start cutting and bending things to get clearance? My '97 F250 doesn't have a lot of room between the engine and firewall.
rplett
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Elder User
Joined: Dec 2001
Posts: 713
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From: C H I C A G O
DOWNPIPE???????
As far as i am aware , installing a bigger downpipe isnt rhe easiest thing in the world to do. Heard stories about people "beating" their firewall for clearance...
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Elder User
Joined: Aug 2002
Posts: 772
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From: Salem USA
DOWNPIPE???????
[updated:LAST EDITED ON 04-Dec-02 AT 02:42 PM (EST)]You'll have to cut the old downpipe to get it out, the replacement is a two piece.
There is a lip where your firewall and body meet that may need to be trimmed or bent a little especially if you go with a larger downpipe, still nothing major.
There is a lip where your firewall and body meet that may need to be trimmed or bent a little especially if you go with a larger downpipe, still nothing major.
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