Any way to get 4" DP in an OBS? - Ford Powerstroke Diesel Forum

 
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post #1 of 9 Old 04-07-2012, 06:32 PM Thread Starter
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Any way to get 4" DP in an OBS?

Ok so like the title says is there anyone out ther with a 4" DP in thier truck, and how much modification to the body did you have to make?

Im having trouble pulling the 3" exhaust downpipe out right now.

From what I have read 3.5" is the maximum you can go. I'd like to try and fit a 4" custom setup in the truck and I figured while I have the transmission out it would be the perfect time to enlarge the area in preperation for a 4".

1995 Blue RC Utility body, 125k AFE Intake, 3" down pipe, South Bend OFEK Clutch, Cobalt Gauges, Boost, Oil temp, EGT.
Future: Dana 60 swap, Pickup Bed, Intercooler, new Rad. support.
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post #2 of 9 Old 04-07-2012, 07:06 PM
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Why do you want a 4" down pipe? That would be soooo much work. A 3" dp is hard enough to get in. It would be easier with the tranny out, but still.

My Truck
97' F-250HD. ECLB. 66,000 miles. 7.3. E40D. 6637 Filter. 5" Exhaust. Deleted EBPV. CCV mod. 45 gal. Transferflow Rear Tank. Stock for now. Dana 60 in the works.
My Dad's
97' F-250HD. ECLB. 18x,xxx miles. 7.3. E40D. 6637 Filter. 4" Exhaust. TW Tunes. Work Truck.
97' F-250HD. ECLB. 150,000 miles. 7.3. E40D. 4" Exhaust. Work Truck.

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post #3 of 9 Old 04-07-2012, 07:13 PM
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Unless it is a really high horsepower truck then there is no real need or advantage for the 4" down pipe. I have seen plenty of 400+ hp trucks with a 3" or 3.5" down pipe.

Tim

2001 F-250 Lariat CCSB, 4x4, ZF6 249k, 6.5" Procomp lift, 37" Toyo M/T's, 20" Fuel Hostages. PIS 160/30's, PHP Hydra, 6637, 4" exhaust, Tank mods, ISSPRO's, 08+ mirrors/tailgate/tail lights, M12000 winch.



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post #4 of 9 Old 04-07-2012, 09:02 PM
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a body lift and some serious time with a porta-power will git-r-done. but like others have said its a lot of work for very little gain. post pics if you attempt
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post #5 of 9 Old 04-08-2012, 11:44 AM
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3in is plenty for a 7.3. no need for 4in.

96 7.3L, RCSB, Race truck

Only regular cab short bed OBS in Nor Cal!
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post #6 of 9 Old 04-08-2012, 12:23 PM
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I make over 400rwhp and have a 3in dp

97 f350single cab auto
4:10 axles spooled front axle
3in down pipe to stack
Intake 6637
140v idm mod
Efuel all built In house
II s475 .90 turbine spool....
Irate T4 304ss up pipes
T500 with gen3 pump
450/400s hush power
Comp built Trans 2100 stall converter
Gearhead tunes

531/1080 on 250/200s

www.73performance.com

Sales@73performance.com
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post #7 of 9 Old 04-09-2012, 04:49 PM
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yep a body lift

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #8 of 9 Old 04-09-2012, 05:26 PM
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When I do it I'm gonna go for a 3.5" DP, I just need to figure out where to get one. I know it's been done.

1996 F350 4x4 CCLB-- I'll miss her

1996 F350 4X4 RCLB zf5 213K
6637
OBA w/horn
DE 5"
PHP tunes
Mud Country 315/75/16

2008 Wr250X

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There u go Tom. John may not be sexy, but he can tutor you, lol.
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post #9 of 9 Old 04-09-2012, 07:04 PM Thread Starter
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ok then I guess im gonna stick with my 3", I had read a long time ago that the best exhaust after the turbo is no exhaust. So I was figuring that a 4" or 5" would have been best but if theres not much point then I wont try and strain myself to get a bigger downpipe when theres not much to gain from it. Maybe i'll just open it up enough so I can pull the down pipe out easier if it's ever needed, if i can open it up at all.

1995 Blue RC Utility body, 125k AFE Intake, 3" down pipe, South Bend OFEK Clutch, Cobalt Gauges, Boost, Oil temp, EGT.
Future: Dana 60 swap, Pickup Bed, Intercooler, new Rad. support.
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