Nice job Roush! Keep an eye on those band clamps, forward side of the Y.

As good as they are, they still have a tendency to leak in front of the Y. I had better luck with them on the other side.

If they sealed for you, that's great - good place to split if it has to come off at some point in the future.



BTW - I wish I would have went with those cats vrs the other Troyer HF's - I don't recall seeing those before.. Did they have the O2 bung welded in like that from the factory?

 

x2
and btw.. nice job. sounds like u had alota fun roush lol

 

I completely missed that post with the link to the pictures earlier. I must have been typing my next post up when you posted it and I didn't notice. I see what you're talking about with the tab and the bung being on the wrong side. The pipe should have been under the tail end of the transmission rather than under the driveshaft. If they were directly on the opposite side of the pipe would they have been lined up properly that the hanger tab would have worked or would they have to be moved up pipe more? I guess it's a moot point though since if the hanger was bolted in you wouldn't have been able to rotate the Y pipe to compensate for the pipe length.

 

I've never seen a band clamp that did seal....and these are no different.

Those cats have no bungs, the ones you see are part of the OBX pipe that I cut off and welded to the cat. In the picture with the cut up resonator you can see that they have bungs on the backside too, I cut behind those and left them because I didn't need them, and because that was the place to cut to keep the overall length the same.

 

Well your missing out then. I got them to seal well. Why would you use them if they leaked Their to damn expensive for that..- Oh well, what-ever you say. Looks good anyway.

 

I'm not sure what the is for.....whatever... The few times I've used one they didn't seal, thats all. I'm sure OBX didn't supply top of the line so maybe there's a style that works better. They are leaks I can feel but don't hear so I don't really care. There isn't much to do to "get them to seal" other than make the bolts tight, I'm pretty sure I managed that just fine....

 

Possible I guess, I'll see what I can do. I'm gonna use the camera to datalog the a/f gauge and tach together so maybe I'll try to upload one of those.... Or, maybe I'll try to make the classic exaust video....you know....camera comes on, you see legs walking over to get into the truck....fires up, revs a little.....then legs come walking back to shut the camera off......

 

haha. I love those videos. maybe there is something wrong with me but I get a chuckle everytime I se one of those. I swear if I ever make one I am going to edit that out.

 

I didn't think you needed to change the tune for long tubes...curious to see how it turns out. You just have an NA 5.4 right? Reuse the old gaskets rather than using the new ones?

...and what's with the Petey Greene eatin' watermelon smilies? LOL!!!

 

They make changes to the O2 reading delay since they are now located further downstream, and anytime you make a large change like that your a/f ratio can swing a bunch. Yes, n/a 5.4. Yes, I'd rather re-use the high quality stock MLS gaskets than to use any cheap aftermarket gasket. I re-used them before when I rebuilt the motor, so this is the 3rd time and they seem to have sealed fine.

 

Why the metallic catalyst rather than ceramic?

FYI, found Cometic MLS gaskets for $35...junk?

 

To be perfectly honest I don't know the difference between the metallic and ceramic, didn't see any defining information as I was trying to choose. Don't know about the Cometic gaskets, they make good head gaskets so would have to assume their exhaust gaskets would be good too.

 

Good call on the metallic, Magnaflow says the ceramics wouldn't flow sufficiently enough for the 4.6 / 5.4 trucks. I'm surprised the piping is 2 1/2" rather than 2 1/4" up there by the header flange.

Too bad they're almost twice the cost of the oval / short oval cats.

 

On my way home I found enough dry road to hand time a 0-60 and 0-100 run...

Last week prior to install I did it twice and got 7.89/21.20 and 7.55/20.87 for an average of 7.70/21.04. With the headers only on for about 15 miles so the computer is still learning (was reset during install) and the a/f at who knows where I timed a run at 7.07/17.56....

 

Nice! Your 0-60 is pretty damn close to my run. You'll smoke me with a tune.

http://picasaweb.google.com/jbrew393...88043316047874