Hey, going to build a new exhaust system for my 92 7.3 IDI. What would you guys recommend as a setup? Keep stock Y pipe or upgrade? 3" to muffller than dual 3's back? or............. Non turbo for now, hopefully will be turbo by the summer. Just want to start by letting her breath a little better. I have the equipment and ability to bend and weld in my shop so the sky is the limit. Thanks!

oh and its gotta sound good of course

 

upgrade that y if you can, it's terrible the way it is.

 

If you can upgrade the Y without to much hassle sure, but if you really plan to turbo, concentrate on something that will adapt well to turbo back. So id go 3.5 or 4" out, dual if you like, and skip the muffler.

 

x2^^^ Go at least 3.5, I'd go 4''

 

he is going to need the muffler until he gets a turbo, i would put it up close to the y so that once he turbos it he can take it out and just replace with a straight.

 

i've been curious what all is actually involved in modifying the stock Non turbo truck(N/A?) exhaust system to fit a turbo downpipe etc?

 

in the turbo kit comes new exhaust sections.these come off the exhaust manifolds and join together into a mount for the turbo.this way the exhaust coming from the manifolds now makes the turbine spin,thereby spinning a cold side wheel as well,which is the side that presses air into the intake.
now after the turbo pedestal,and after the exhaust has spun the turbine wheel,it needs to exit still.this comes right off the turbine in a single tube,called the down pipe.the down pipe is the new start of your exhaust system.
now a little off topic,but going the whole way of the basics;
since hot exhaust is used to spin the turbine,the pressure and the heat is what makes the cold side wheel spin forcing large amounts of air into the engine.however,the internal combustion engine wants cold,dense air.a negative side effect of the turbo,is that the cold side heats up of course too since it's mounted right together.so to get the air back (as close as possible,without going needlessly to large,but not so small it heat soaks) to ambient temps is to use an intercooler.simply a heat exchanger between the cold wheel and intake.


here was my n/a exhaust upgrade,which worked very well;
https://www.ford-trucks.com/forums/9...e-exhaust.html

only thing id do different today,would be to use a large truck muffler instead of the straight through style.
it's nice now with the turbo,but was too much as n/a.save yourself the headache.run a real muffler.

 

Hm, a little more confusing than i thought. When you say new exhaust sections that come off your exhaust manifolds. does this mean you no longer have the two headers running down to meet at your "y-pipe"? and that they instead bolt on new sections that meet the turbo and then exit through your down pipe?

 

im pretty sure your understanding correctly yes.
exhaust manifolds (headers) joining together into a turbo pedestal by way of what are called "cross over" pipes to drive the turbine and exit through the down pipe.

 

AH! Okay, so i'm not that ignorant (:
I understand what your saying, so remove the stock down turned headers and install new ones that come with the kit, they go into the pedestal, turbine spools and exhaust exits through the down pipe. wonderrful!

 

yeah.only i don't think any of the kits actually use a different exhaust manifold.the stock ones are still used.you just bolt the cross over pipes to them,then those go to the turbo pedestal.but trivial.you've got it.

 

But those go all the way down the side of them headers go all the way down the side of the motor and then bolt to other pipe and there aint no other holes on top?

 

Great info from everyone. Im thinking new headers, muffler at the Y pipe, and single 4" straight out the back.... Once turbo installed, install crossover pipes and turbo and delete muffler. As far as the Y pipe is concerned, I might have to try and fab something up. Sounds like a challange....

 

Headers are pricey. And especially if you plan to turbo i would not waste the money even on flanges.

What i would do, is basically modify the stock Y its for of a T than a Y, take a look at it and you will under stand. Smoot that out a bit and go from your new Y 4" out.

The Y will become useless with a turbo kit as its replaced. The down pipe exits underneath roughly in the same spot the factory Y is.

As far as going bigger on the Y pipe.. pretty much moot as the manifolds would still be the restriction. If you really want to maximize NA power gain via exhaust, you would want true duals.

Best advice i can offer, dont over think it.

 

You have the capability to bend 3"+ exhaust pipe?

I couldn't find one shop in the entire Treasure Valley capable of doing that.