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post #1 of 15 Old 03-03-2009, 02:31 PM Thread Starter
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DIY exhaust questions

i posted this in another thread but i wasnt paying attention and i figured it might get some better responses here.

ok i've been looking at doing this for quite a while. im going to hold off on the opened up downpipe for now until spring/summer rolls around. i can get a 10' 4" pipe for about 77 or so bux from a local store. only problem is i'm planning on doing a side dump in front of the back tire. i haven't measured it yet but i know i don't need 10'. the longest sizes they do otherwise is 3' lengths. i also found pipes on line i can order by the foot. so here's the main question:

is the stock downpipe, coming rite before cat 3.5" or 3". i found the universal MBRP adapters online as well at ADAPTERS . id either go with 4" or just play 3.5". id like to get this done as soon as possible because ive been putting it off for far too long. i just cut off my muffler and back yesterday, its a little deeper but no big difference as im guessing the cat makes a big difference as well so i want that gone.

o yea heres the link with the exhaust tubing. TUBING


what would you guys do with that given info???
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post #2 of 15 Old 03-03-2009, 02:47 PM
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i'd say the stock downpipe is 3.5" at the flange where it meets the cat

just guess at how much pipe you would need, and put a 4" 45* pipe on the end so that you can dump it at the side

Typical cummins owner.

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post #3 of 15 Old 03-03-2009, 02:49 PM
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Its 3.5 I'm pretty sure!

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post #4 of 15 Old 03-03-2009, 02:53 PM Thread Starter
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Quote:
Originally Posted by taylorking View Post
i'd say the stock downpipe is 3.5" at the flange where it meets the cat

just guess at how much pipe you would need, and put a 4" 45* pipe on the end so that you can dump it at the side
i would do that...except i have a crew cab..so thatd be coming out rite at the side of my cab, id much rather have it at the back in front of the tire...im just gonna heat it and bend it as needed. i just wanna get all the diameters rite and need some people to confirm what i should do ya know?
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post #5 of 15 Old 03-03-2009, 02:56 PM
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yea....so get a 3.5" to 4" adapter, slide that on and your good to go

Typical cummins owner.

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post #6 of 15 Old 03-03-2009, 03:02 PM
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if you cut it before the flange at the end of the down pipe its actually 3 inches, I did the same thing and ended up having to crush the 3.5- 4 adapter a lil to get it to fit. The cat is 3.5 - 3.5 but the down pipe is 3 at the flange so if you have some pipe after the flange cut it there or get a 3-4 adapter.

ps, best bet is to get under the truck and measure, wish I'd done that lol.

Early 99 7.3L
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AFE stage II
TW tunes
5" strait pipe, black
Rebuilt Trans w/ Banks TQ
Manual TC lock up mod
DIY EBPV mod
Zoodad mod
4.5" leveling w/ 35'' procomps
one piece headlights w/ warn spots
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post #7 of 15 Old 03-03-2009, 05:33 PM Thread Starter
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ok..well if i got an adapter for a 3.5" to 5"OD....if i got a length of 5"OD they obviously wont go together, what do you do in that situation??? ill go out tomorrow and measure some things up when its warmer
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post #8 of 15 Old 03-03-2009, 06:35 PM
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I guess what youre saying is that two pieces of pipe that are the same OD wont go slip together... right, so when you buy the adapters make sure to get the ones that have the bell already stretched out to slide over, they are about twenty bucks at my local truck shop.

Early 99 7.3L
Ultra lite EGT, boost, TT
AFE stage II
TW tunes
5" strait pipe, black
Rebuilt Trans w/ Banks TQ
Manual TC lock up mod
DIY EBPV mod
Zoodad mod
4.5" leveling w/ 35'' procomps
one piece headlights w/ warn spots
smoked taillights
2.5% window tint 30% in front
sony stereo +amp ADS 10" subs
on dash dvd.
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post #9 of 15 Old 03-03-2009, 07:30 PM Thread Starter
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ok well i found adapters to connect same sized pipe. now please talk me out of doing a six inch exhaust...i think im going to do a 5" now for sure, why shouldnt i go 6???...im begging you to talk me out of it just to save my self some cash
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post #10 of 15 Old 03-03-2009, 07:36 PM
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well I dont think I can, I went into the truck shop with a 4" in mind and did the 5" instead, guess it wouldn't be much more to do six lol.

I do think you may lose some of the tone that you often relate to a good sounding diesel, the 7.3l doesn't sound as good to me with huge pipe like that, but it will certainly be loud and turn heads...

Early 99 7.3L
Ultra lite EGT, boost, TT
AFE stage II
TW tunes
5" strait pipe, black
Rebuilt Trans w/ Banks TQ
Manual TC lock up mod
DIY EBPV mod
Zoodad mod
4.5" leveling w/ 35'' procomps
one piece headlights w/ warn spots
smoked taillights
2.5% window tint 30% in front
sony stereo +amp ADS 10" subs
on dash dvd.
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