question for the pro's

[eclipsegt123]

I have a 03 f350 and today when i was under the truck I realized that my down pipe from my turbo was stock and went into a 4 inch pipe. what size is the stock down pipe and if i go with a 4 inch from my turbo back to where the 4 inch meets up will i notice a difrence or not???

[mike 6.0]

Stock dp is 3 inch. Yes you will hear the difference and your engine will thank you for the lower egt.

[psd_va]

isn't it different between 7.3 and 6.0 i thought the 6.0's had 3 1/2 dp and 7.3's had 3" dp. could be wrong just would like to clarify

[Evil Eye]

Yes, the stock downpipe on the 6.0 is 3.5" and you won't have any noticeable difference by upgrading to the 4" downpipe other than a bunch of dents in your firewall from having to beat the new downpipe in place...

[2006PSDSD]

Originally Posted by Evil Eye

Yes, the stock downpipe on the 6.0 is 3.5" and you won't have any noticeable difference by upgrading to the 4" downpipe other than a bunch of dents in your firewall from having to beat the new downpipe in place...

That's no chit! Everytime my truck articulates a bit, that engine sounds like its sitting in my glovebox because the DP is hitting the firewall

[Evil Eye]

Articulation in a Super Duty?? You make me laugh, sir.

BTW, I didn't notice much (if any) difference when I upgraded my downpipe from the stock (3.5") to the aftermarket downpipe (3.5"). If I had to do it all over again, I might have just gone with the cat-back system.

[2006PSDSD]

It twists, a little . It doesn't take much to make that DP kiss the firewall

[psd_va]

Is there much of a egt difference between 3.5 and 4 inch dp?

[azkcr]

Not enough to write home about..
And I have a 4" DP, I'll admit it gave me problems but once I got it in just the right spot it has yet to do rub. This has been 2.5yrs now

[2006PSDSD]

You don't have any hills in TX to test that out on though, Ben . I should fix mine, because all that weight that's on the DP, is directly added to my turbo