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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

       
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Old 10-08-2006, 12:02 AM   #1 (permalink)
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7.3 IDI straightpiped AWESOME

Man today I heard the best sound exhaust on any car or truck ever. This kid who has a older 7.3 91 I believe straightpiped his truck or i think he did. I went over to ask him a few questions about it but he was kind off quiet about what he did. But boy this thing is wicked when he gets on it. Very intimidating. Its a true dual exhaust to with 5 inch chrome tips coming out at 45 degree angles in the back. The older 7.3s without turbo sure dont make the power the newer trucks do but boy the sound makes it sounds like a big block gasser. Anybody have this setup on there trucks?
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Old 10-08-2006, 05:25 PM   #2 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

I have a single exhaust with a glasspack and 4" tip, sounds the same as a straight pipe just not quite as loud.
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89 F350 7.3 IDI Diesel, 110,000 miles, Black and silver, single cab long. 4x4 XLT Lariat. 5 Speed Manual, very clean truck. Banks sidewinder kit, 4" dual stainless magnaflow exhaust, 4" skyjacker suspension kit with rear add leafs. Chrome Pro Comp wheels, 35" Pro Comp Mud Terrains.
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Old 10-10-2006, 08:46 AM   #3 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

I did that to the Moosestang when I first built it. But unlke an F series where the exhaust exists 10 feet back, on the Bronco, it was about 2 feet back. I drove around thinking I was carrying a huge sign that read "Arrest this man" [img]/ubbthreads/images/graemlins/eek.gif[/img] Not only that, but my fillings were coming loose. I stuck a pair of cherry bombs in the side pipes and never looked back.
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Old 10-10-2006, 10:51 AM   #4 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

Have a single 5" straight pipe on my turbo IDI... sounds mean as all hell ..
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Old 10-10-2006, 03:52 PM   #5 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

I want duals on my truck. 89 7.3 IDI. I think I will have to have them custom bent.
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Old 10-11-2006, 03:58 PM   #6 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

We have a 4" straight exiting to the side, in front of the tire on the 93 turbo dually. Sounds pretty good, raps like heck.
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Old 10-11-2006, 06:27 PM   #7 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

My one housemate had a single 3" on his 6.9, and it sounded, very, very nice. Recently he put a 4" dynomax race bullet muffler on it, and it quieted it down just a tad, but still sounds nice.

Mine has a 2 1/2" straight pipe into 3" tips, and I think it sounds decent, just not deep enough.

Another housemate(as well as my ol' man) has 2 1/2" duals with cheery bombs on theirs, and it sounds alot like a big block gasser.
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Old 10-11-2006, 06:44 PM   #8 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

Hello all, my 1989 F-250 has the good ol' 3" straight pipe, from the Y-pipe all the way back, with a 5" slash cut tip. Sounds loud, and is more than capable of setting off car alarms (oops?...hehehehe....), and drowning the 3,000 watt sound systems in cheap import cars. Also, it sounds real good when the engine's noise resonates off the walls on the highway. STRAIGHT PIPES ARE AWESOME!!! "LOUD PIPES SAVE LIVES"
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Old 10-11-2006, 08:13 PM   #9 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

my 6.9 has the factory ypipe into a dynomax bullet muffler, the to 4 inch stack. yes, stack.

sounds great.

but i now have headers on the way, gona run dual bullets and dual stacks. still probly gona throw a h pipe in.
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i'd rather be 6.9'n than cummin or strokin'!
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Old 10-15-2006, 02:31 AM   #10 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

I had a 4" setup from just below the manifolds back on an 86 350 that exited in front of the rear wheel . That thing sounded MEAN ! My roomates hated it when I left for work in the morning at 4 am . It was a 4x4 welding truck and I'd always get called to recovery/repair missions . The bystanders always claimed they could FEEL the exhaust blowing on them from 30+ feet away when redlined pulling somebody out
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Old 10-15-2006, 06:54 AM   #11 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

strait pipes are the way to go. its the real sound of the engine no changes, i love it. I have an 86 F250 with a 6.9 and it has strait pipes with the factory pipes up the the bed then 4 inch stacks. it gives me good backpresure for excelleration with a louder sound and the 4" stacks give it a good ecco. when my 86 F250 with the DT466 is done I will have 4 inch straitpipes with 6" dual bullhauler stacks.
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Old 10-15-2006, 06:08 PM   #12 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

I've got dual straight pipes on mine and it sounds deadly. wouldn't trade that sound for the world!!!
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Old 10-15-2006, 09:04 PM   #13 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

Now on these 80's and early 90's fords what they sound like.. ( i am just getting into ford diesels so not familar with them) but i know the dodge diesels sounded like a roaring semi truck coming down the road........... whats these older fords sound like??

Do they sound like them big 400 gas motors? or dound like a diesel semi?

THanks
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Old 10-15-2006, 10:13 PM   #14 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

sound like a bigblock, but....different.
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i'd rather be 6.9'n than cummin or strokin'!
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Old 10-16-2006, 12:28 AM   #15 (permalink)
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Re: 7.3 IDI straightpiped AWESOME

I always thought that a straight piped 5.9 Cummins sounded about like DT-361 in a Farmall 1206. The semi is close also. If you know what a 534 Ford V8 gas in an early 60's straight truck with dual straight pipes sounds like, you might get close to the 6.9/7.3 They have enough displacement to mimic the high compression of the 6.9/7.3. The 351M/400/429 and 460's, just dont have the deep bellar 6.9/7.3's do. The 534, OR a 430 Lincoln V8...Helped a buddy restore a 63 Lincoln Continental had a set of custom headers on that baby, and we took it out on a fresh solid lifter rebuild....SOUNDED AWESOME till we got a little to heavy on the go pedal and hopped a pushrod, whoops. No damage and the "stinkin lincoln" lives to fight another day. Those 2 are about as close as you'll get...

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-93 Ford F250 7.3L IDI Turbo Diesel, ATS upgrades, 4" exhaust and 5" stainless tip, 5 speed, 4wd, 3.55's, maroon on silver, American Racing rims, custom built air gate, DMI rear bumper, extra clearance lights.
-61 Ford Falcon Futura, 289HIPO, T10 4 speed, 9" rear w/ cleveland locker and 3.55's, linelok, Granada front discs.

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