Exhaust sizing
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Senior User
Joined: May 2005
Posts: 129
Likes: 1
From: spokane WA
Exhaust sizing
Ok, not going to go wild on mods, but guess I will play with the exhaust and intake a little.
Going to do a bit of a ram air.
Whats the opinion on exhaust. Will it be enough to just change out the 2.5" pipe out to 3"?
I mean just changing the portion from the y out.
Only reason I don't want to go bigger is the biggest mandrel bend dies I have at work is 3" so I can do it myself and it will be a nice job.
Other option is duals with crossover or x pipe.
I can buy some bigger bends and cut and weld, but would rather just bend up and entire system and be done with it.
Going to do a bit of a ram air.
Whats the opinion on exhaust. Will it be enough to just change out the 2.5" pipe out to 3"?
I mean just changing the portion from the y out.
Only reason I don't want to go bigger is the biggest mandrel bend dies I have at work is 3" so I can do it myself and it will be a nice job.
Other option is duals with crossover or x pipe.
I can buy some bigger bends and cut and weld, but would rather just bend up and entire system and be done with it.
Posting Guru
Joined: Oct 2005
Posts: 1,030
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From: Powell River B.C.
If you have the equipment and material to do 3" it will make a big improvement. I had a shop put on my 3" system and the bends were a bit retrictive, so after I put a set of headers on I went with a full 4". You can buy the whole back end from 94-97 PSD, aluminized steel not too expensive. I had to fab from headers to a Y with 3" then a straight lenght back to the 4" flow through muffler, all spounds awsome, and is a bit louder than the 3" system I had.
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
I did it on mine, also have a tech article on the home page about how I did it, but it sounds like you have better toys to play with on making it. I changed mine to run back from the passenger manifold to meet right where the 3" pipe starts. I also capped off the hole where the factory y met. Now the pipe from the passenger header runs straight into the pipe, and the other angles in. I'm pretty happy with how it works. I built mine from used medium duty truck pipes... Started with 3.25 pipe, then expanded up to 3.5, 4 " tip by using those pipes. The bends were there, I just had to arrange them to work for my setup.
Thread Starter
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Senior User
Joined: May 2005
Posts: 129
Likes: 1
From: spokane WA
Yea, we got a pretty good mandrel bender at work. Makes perfect bends. Figure I will straighten it out a bit too, no need for as much bend as the factory has.
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Lead Driver
Joined: Nov 2003
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From: Campbell River, B.C.
I wish I had access to a mandrel bender, I also went to a 3" pipe when I put a turbo in. I had to use three 90* elbows sparringly to make mine up (all stainless). It has many tig wield joints..... 
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Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
Originally Posted by 72f2504x4390
Yes its very nice. We bend a lot of stainless too. Spendy but sure is nice.
. I try to raplace with stainless as often as I can, I don't feel like dealing with rusty pipes if I can help it.