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Old 08-01-2012, 07:06 PM
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Default obs downpipe

Does anybody have a obs downpipe that is bigger than 3 inch that they wanna sell or know anybody that could make one
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Old 08-05-2012, 05:36 AM
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FWIW 500+ hp through a 3" dp has been done for years.

Anything larger than 3" will be full custom requiring a lot of custom work to the firewall. If you have the skills to mod your firewall that much, then you can make your own dp.
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Old 08-05-2012, 06:54 PM
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I got ahold of Jake at irate and i think I'm gonna try his 3 inch dp. I'm sure it will flow a lot better than my $hitty home made dp
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Old 08-05-2012, 07:17 PM
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Originally Posted by obspsd View Post
I got ahold of Jake at irate and i think I'm gonna try his 3 inch dp. I'm sure it will flow a lot better than my $hitty home made dp
Yeah, I can see that being the restriction. Optimum taper is 7 degrees for a transition in pipe size with 4 to 12 degrees acceptable. I think you had 45* on the top right at the outlet ? I will be cutting my firewall.

I believe your exhaust wheel is 92mm? Which is a 3.62" wheel which tapers out to a 5" hole covered by a 3" pipe. Commonly used calculation for optimal downpipe sizing is exhaust wheel size x 1.25. For you that would be 115mm or 4.52". Just saying...

3.5" is good to 750 hp.
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Last edited by fatsix; 08-05-2012 at 07:28 PM.
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Old 08-05-2012, 08:32 PM
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Ricer shop in my area would do a 4" downpipe and ovaling it down to about 3.5" for clearance in an OBS for around $400 or so but has to have the truck for a week.
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Old 08-06-2012, 04:57 AM
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Yea there's a rice shop in my area that's pretty good too I just wasn't really trying to pay 400-500 for a dp unless i have to
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Old 08-06-2012, 08:36 AM
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Quote:
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Yea there's a rice shop in my area that's pretty good too I just wasn't really trying to pay 400-500 for a dp unless i have to
You gotta pay to play...
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Old 08-06-2012, 09:45 AM
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Unfortunately i know this, that's why i said unless i have to
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Old 08-06-2012, 01:13 PM
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My s475 with jakes down pipe. and you deff need to massage the firewall



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Old 08-06-2012, 04:47 PM
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Hypermax has a good downpipe with there mount kit. I didn't have to massage anything it fit right in. Looks pretty similar to jakes.
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Old 08-06-2012, 04:59 PM
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Yes they do, i called them too. Jake is more economical
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Old 08-07-2012, 12:40 AM
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Hypermax has a good downpipe with there mount kit. I didn't have to massage anything it fit right in. Looks pretty similar to jakes.
Isn't the hypermax pipe a 3"?
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Old 08-07-2012, 03:09 AM
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Starts off as 3" then goes to 3.5"
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Old 08-07-2012, 09:14 AM
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The amount of firewall massaging to get a 3.5in down pipe on a obs with a s475 charger is retarded not worth it
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Old 08-08-2012, 02:09 AM
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There is no firewall massaging with a 4" downpipe. You just get out your cutting torch.
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Old 08-08-2012, 02:08 PM
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Quote:
Originally Posted by old man dave View Post
There is no firewall massaging with a 4" downpipe. You just get out your cutting torch.
There's plenty of room.

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Old 08-11-2012, 09:29 PM
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How much massaging is needed to get a regular 3" down pipe in there for a stock turbo?
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Old 08-11-2012, 10:37 PM
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Quote:
Originally Posted by Choupique108 View Post
How much massaging is needed to get a regular 3" down pipe in there for a stock turbo?
Depends on the truck, mine needed massive amounts of swearing & beating to fit. Makes me wish I never took the hood stack off every time it rubs. Also get pissed off every time I install a 4" DP into a SD in about a minute with no modifications to the firewall/down pipe.
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Old 08-11-2012, 10:54 PM
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I just got the engine out of my '96, after seeing the stock down pipe it will be going back together with a 3" dp. I just don't know exactly how much to "massage" the firewall without the engine in for reference. Anyone have any pics that might give me some ideas?
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Old 08-12-2012, 05:03 AM
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I can get a 3in diamond eye down pipe into a obs from pulling old to new in in about a hr. key is a good pry bar
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Old 08-12-2012, 06:25 AM
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Pry bar its also my tool of choice, with an occasional mallet
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Old 08-12-2012, 06:50 AM
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Threads like this make me appreciate my body lift
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Old 08-12-2012, 07:14 AM
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Originally Posted by TheSmokinStroke2002 View Post
Threads like this make me appreciate my body lift
threads like this make me jealous of your body lift...



I do need new cab bushings....
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Old 08-12-2012, 07:30 AM
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threads like this make me jealous of your body lift...



I do need new cab bushings....
Putting the trans in the truck this weekend was so much easier with a body lift.

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Old 08-12-2012, 07:34 AM
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Originally Posted by 6.0 p-stroke View Post
I just got the engine out of my '96, after seeing the stock down pipe it will be going back together with a 3" dp. I just don't know exactly how much to "massage" the firewall without the engine in for reference. Anyone have any pics that might give me some ideas?
Usually slides in there the cab angles back. Get yourself a BFH & go do work.
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Old 08-12-2012, 07:40 AM
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Originally Posted by 6.0 p-stroke View Post
I just got the engine out of my '96, after seeing the stock down pipe it will be going back together with a 3" dp. I just don't know exactly how much to "massage" the firewall without the engine in for reference. Anyone have any pics that might give me some ideas?

It's mostly around the pinch weld area.
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Old 08-12-2012, 07:56 AM
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Putting the trans in the truck this weekend was so much easier with a body lift.

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Think you can fit a full 4" in there with that 3" lift?
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Old 08-12-2012, 07:59 AM
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Think you can fit a full 4" in there with that 3" lift?
Yes. It would be a custom fit, but yes. my buddy has one on his 96 with a 3" body lift.
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Old 08-12-2012, 08:10 AM
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Yes. It would be a custom fit, but yes. my buddy has one on his 96 with a 3" body lift.
Why can't you just use a SD downpipe?
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Old 08-12-2012, 08:13 AM
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Quote:
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Why can't you just use a SD downpipe?
You could if you cut and re welded the flange. Different flange on the turbo.
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Old 08-12-2012, 08:19 AM
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dammit.
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Old 08-12-2012, 08:20 AM
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Wait. could I use the flange off of the stock DP?
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Old 08-12-2012, 08:22 AM
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Quote:
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Wait. could I use the flange off of the stock DP?
Yes
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Old 08-12-2012, 08:32 AM
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Yes
Sweet. Now I just gotta find a 3" body lift for a crew cab... not fun :/
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Old 08-13-2012, 05:47 PM
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Quote:
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Sweet. Now I just gotta find a 3" body lift for a crew cab... not fun :/
Do they make it? Lol

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Old 08-14-2012, 12:33 AM
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They do, but not for diesel (not like I have to pay attention to that), but I only want it for the cab, as its getting a flatbed.

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Old 08-14-2012, 04:50 AM
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Quote:
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Think you can fit a full 4" in there with that 3" lift?
I wouldn't say a 'full' 4" dp will fit with a 3" body lift.
I have one on my '96, and the pipe is massaged heavily to fit.
Still, it's quite larger than a 3", but it's dimpled good here and there to clear everything.
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Old 08-14-2012, 04:56 AM
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Quote:
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I wouldn't say a 'full' 4" dp will fit with a 3" body lift.
I have one on my '96, and the pipe is massaged heavily to fit.
Still, it's quite larger than a 3", but it's dimpled good here and there to clear everything.
How bad do you have to massage it? Also did you custom make the full downpipe or modify a superduty one?

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Old 08-20-2012, 11:08 PM
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Quote:
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Sweet. Now I just gotta find a 3" body lift for a crew cab... not fun :/


I can machine you steel 3in or smaller or bigger body mounts.pm me if interested
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Old 08-30-2012, 08:38 AM
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I put a 4" DP on mine....cut the firewall out , fabbed the pipe from a NAPA short 90 & a long 45 with a slip joint in it ....fit the pipe to a plate welded to a short chunk of 3" (about 3/4" long) directly behind the turbo, then fabbed a heat shield and steel cap for the firewall.....

PITA, but cools better....it's not always about how MUCH hp you make, but about how much heat you can get rid of....

I don't do anything BUT tow with this rig, (20,000 lbs gross), and the long hills (12 miles - 6%), out here on the west coast will test everything.....
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Old 09-04-2012, 05:06 PM
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Did you take the dash out to do this
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350/200 Full Force Hybrids, gen 3 oil, s468, H11s, comp 910s, Irate t4 mount, homemade RR fuel system... Twisted tranny
  #42  
Old 09-04-2012, 10:10 PM
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no.... cut the floorboards out.
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'97 Centurion. F350 4x4 CCLB
Full Force 180cc Stage I's, D66, Stealth SRP-1.1, ARP, Banks IC,
DIY E-Fuel, EBPV Del & Gut'd Ped., BD Brake., SD IDM, HPX, BstFoolr, DIY 4" DP - 4" exh
6.0 Fan, 180 T-Stat, DIY Don.105006 AF, CCV Mod, BTS, 3/8" Cooling lines, Tru-Cool Max, PML, Bumper Mod, Gauges, Fluidampr, Mellings LPOP..... Tuned by "The WildMan".....

  #43  
Old 09-26-2012, 07:06 AM
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Well i had the cab off for head gaskets so i went ahead and made a full 4 inch downpipe, slightly ovaled but it clears everything! Some messaging was necessary
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350/200 Full Force Hybrids, gen 3 oil, s468, H11s, comp 910s, Irate t4 mount, homemade RR fuel system... Twisted tranny
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