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Author
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Topic: running 3" exhaust over the axle?, '78F150
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Rustang
Gearhead Posts: 276
From: Dubois PA
Registered: Nov 2000
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posted 06-19-2002 10:12 PM
   
I'm going to start putting my new 460 in this week, along with a completely new exhaust system consisting of Hooker Super Comps, 2-1/2" pipe back to a flowmaster 2 into 1 Y-pipe that goes into a 3" single exhaust. My question is, has anyone tried to use an off-the-shelf 3" over-the-axle exhaust from like a later model diesel(Ford or even from a Dodge) that might fit my '78?------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
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MLariviere
Moderator Posts: 2538
From: Biddeford,Me.USA
Registered: May 99
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posted 06-19-2002 11:29 PM
No,but I think you could make it work. The wheelbases are very alike.
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Boss302
Gearhead Posts: 310
From: Coleman, Wisconsin
Registered: Jan 2002
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posted 06-19-2002 11:31 PM
i don't have an answer to your post, but i'd just like to say that i love it that you are bringing your trucks along with your cars to the track. i think thats so kool
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SteveLaRiviere
Administrator Posts: 24286
From: Saco, Maine Toys: '70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
Registered: May 99
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posted 06-20-2002 08:16 PM
Plenty of room to work with, too.------------------
'70 Mustang Mach 1, '72 Mustang Sprint, '94 F-150
MCA Member # 47773
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Rustang
Gearhead Posts: 276
From: Dubois PA
Registered: Nov 2000
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posted 06-20-2002 09:31 PM
I was hopin' I wouldn't have to be the guinea pig on this one! Oh well!By the way, I'm predicting 13.90's thru the muffs on street tires. 
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Dad Vishus
Journeyman Posts: 75
From: Moscow, Iowa, USA
Registered: Dec 2001
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posted 06-21-2002 02:25 PM
Don't know about of the shelf 3" pipe, but I did exactly the same thing on my 85 E-350 van and had a local shop bend up the 3" pipes. Worked great. I used a Dynomax 3" in/out motorhome muffler. Used the same Flowmaster 2-2.5" in/3" out piece hooked to 2.5" header cones. The whole system was quiet and seemed efficient.This van had a 73 Police 460 in it with a Comp Cams cam and was very noisy with any dual system that had been on it. I don't know how many shops have the capability to bend 3" pipe, but in this case it was probably cheaper than a replacement 3" pipe for a diesel. They bent the pipes for me and installed the whole deal for less than $100. It worked so well that we did the same setup on my Dads 84 class C Ford motorhome. Works great on that too.
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Dave_C
Gearhead Posts: 499
From: Gadsden, Al
Registered: Aug 99
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posted 06-22-2002 09:55 PM
You system sounds very close to a bolt on system that Flowmaster sells. I had one on the 92 F150 that I sold last fall before I bought my F350. It should fit your truck as the wheelbase hasn't changed. You might have to install new hangers as the kit was designed to use the factory hangers. It was a true bolt on. Less than 2 hrs, including removing the factory system. #17135 $227.95 @ Summit or other mail order. It is cat back 3". You could just attach the pipe to your Y like I attached mine to the cat. The kit has several parts: 1. 3" pipe after the cat. Cut this pipe to length depending on wheelbase for regular, super or crew cab.
2. One of their "Big Block" series mufflers. This thing is big. Single 3" in/out, about 30" long X 12" wide. Sounds great.
3. A 3" mandrel bent tail pipe that goes up and over the rear, exits behind the right rear tire in the stock location, can be adjusted to angle the pipe down, back or straight out.
4. Clamps. Any questions just ask. Later, David Cole
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Rustang
Gearhead Posts: 276
From: Dubois PA
Registered: Nov 2000
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posted 06-25-2002 09:15 PM
David, that sounds like the solution I'm lookin' for! I'll just have to crawl under a few late models at work this week and compare it to mine. Things like shock absorber position, etc.. If everything looks similar, I'm probably going to spring for the cat back setup. How does it sound, anyhow?
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Dave_C
Gearhead Posts: 499
From: Gadsden, Al
Registered: Aug 99
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posted 06-25-2002 10:54 PM
It sounds great. Or did. As I said I sold it last fall, but I still see it. The guy that bought it only lives 3 miles away.The sound was not your typical flowmaster drone. It was a little louder than stock, but had a good low tone to it. It seemed like it made a seat of the pants difference in towing also. Not much diff down low as the truck had 3.55 gears and a HD AOD with a 2.75 low first gear. Starting from a dead stop those gear ratios didn't need much help. Where it seemed to help the most was from about 20 to 60 mph. One other thing. The whole system is aluminized. Very rust resistant. The factory muffler and tail pipe rusted out in 4 years. Put the Flowmaster system on a five years later it's good as new. Flowmaster has some sound files on their web site. Go here:
http://www.flowmastermufflers.com/web10/SePerfMuff8.html
Listen to the one one on the bottom left. The 2001 GMC 2500. My truck sounded very close to that. Also here is a link to a diagram of the system:
http://www.flowmastermufflers.com/web10/openrd/showthread.php?s=80110d0ee5654f281041273db9b96614&threadid=304&highlight=17135 Later, David Cole
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