OBX's going on my 01 4.6L 4x4
 

After seeing how well they worked out for 01Roush, I've decided to go this route as well. I do have a few quick questions though. I've ordered Troyer's O2 extenders for the front sensors, but what do I need for the EGR issue? I will be going with Cometic or Felpro MLS gaskets, and have ordered Troyer's stage 8 locking header bolts. (How do these work?)

Am I missing anything? Check the specs below, but I plan on running single 2 1/2" pipe, because I ran 3" on my current setup for about a year and lost way too much torque. Not sure how the longtubes will effect that, but I'd say 3" would be overkill without boost.

Current setup:
-stock manifolds
-no pre-cats
-factory primary cats
-Flowmaster "y pipe"
- 2 1/2" straight pipe dumped before the axle

Coming soon:
-OBX longtubes
-2 1/2" Magnaflow spun cats
-single 2 1/2" pipe dumped before axle
-either no muffler again or the loudest Maggie (11") / Flowmaster (Super 40) I can find

Any speculation as to what it might do to HP / TQ / MPG's compared to the current setup? It had better be $1,000 worth. ;)

You should be ok with a single 3" setup. http://www.troyerperformance.com/cgi...atalogno=15609

Where did you find those Troyer O2 extensions? I looked but didn't see any on Troyers site.

Maybe because I'm running straight pipe with only 2 cats or something, but Troyer is the one who talked me into trying the 2 1/2" pipe from 3" after complaining about torque loss. I'll be sure to ask him which way to go between now and then.

Apparently less than 10% of Troyer's inventory is on the site. You have to call Anita to get the good stuff. ;) Beware, they are $28 a pop vs. the BBK's @ less than $20 a piece, but there is no modification necessary and I assume they are custom spec'd if not Dynatech supplied.

jbrew, what do I need to adapt the EGR tube? ;)

Oh that's what you wanted to know. I posted info here -

https://www.f150online.com/forums/sh...=320675&page=2

Better info here -

https://www.f150online.com/forums/sh...=318717&page=7

I found everything @ Home Depot. The easiest route is to get a reducer fitting 3/4 x 5/8 or 1/2 , depending what's easier for you to do - Drill and thread or Drill and weld. I got lucky and found a nipple that worked for me in the Washer and Dryer section in the store..The reducer was found in the gas fittings section (Brass Only) - If your welding , get the steel reducer. If you can't find the correct size , those are your choices..

Thanks man!!! Sounds like I need to figure out the tread pitch so I can try to pin down a reducer. If anoyne knows, I'm all ears and will do the "leg work" to find the right part. What a pain.

No problem. I think right now - it's easier to make one up with a welder. The correct thread for the 3/4 EGR port on the header is easy to find. The hard part is finding one reduced to the fine metric thread of the 4six nipple.

Yea , if there's a better way , I would like to know . I've searched it out a few times with dead ends.. Someone needs to make one that you can just purchase..

I didn't realize that Dynamax didn't offer a specific set for the 4.6. Troyer needs to spec one out for his small 4.6 customer base. ;)

They're on the way. This guys has them for $499 shipped & insured, but you have to hound them to list another set.

http://cgi.ebay.com/ebaymotors/ws/eB...3D0%26_fvi%3D1

Any idea if OBX utilizes any of the factory hanger locations? If not, how did you go about hanging everything? My shop can get me whatever I need to finish out the exhaust with SS, but they don't use SS wire in their MIG...problem?

Found the Magnaflow 59956's for $80 shipped!!!

http://www.planetmagnaflow.com/shop/...59956-688.html

It will weld fine but the welds will rust. I picked up a 2lb roll of stainless wire for around $12.


Damn. I thought I did good at $105 shipped!

Hahaha...there were 10 left when I posted this, now they're sold out till the 11th. of March. Somebody must be doing the same thing huh? Thanks again for keeping us up to date on the install 01Roush. Hopefully I can be of some help with the 4.6 install. I went with the non-"L" / Harley kit because I intend to run a single pipe still.

Think I'm going to buy factory 5.4 and 4.6 EGR fittings and weld em up. I found this, but don't think the 4.6 threads are right.

http://www.hardwareandtools.com/invt/8920399?ref=gbase

The only reason 01Roush and myself went with the Lightning/Harley version was because the non Lightning/Harley version merges two 2.5" pipes into a single 2.5" pipe. I don't like the idea of that. It may not be very important, but just doesn't make sense to me to shove a size 12 foot in to a size 6 boot. With the Lightning/Harley version, you can put a Y pipe on that merges the two 2.5" pipes into a single 3 inch. If you're running a 2.5" single pipe then it's perfect though.

I looked for a few more hours this morning for a 16 x 19 metric nipple . I got close , but no stoogie.

I've found one like you have before Jackal - well, maybe , the 5/8 side looks damn close, but you might have a different thread pitch. What PITA finding a 5 dollar part. I plan on making a bunch of these up - it's on the todo list.

3/4 or 19mm will work because it's so close in size - within .020.

It's the 5/8 16mm side that's a biatch. more distance between the two numbers and the fine thread pitch.

I have quite a few brass reducers 3/4 x 1/2 . With the proper drill and tap - I could whip a dozen of those damn things up right quick. I can't at the moment , but I will when I get the chance.

I tried running a single 3" when I replaced my factory "Y pipe" with the FM "Y pipe", but even with all 4 factory cats I lost too much low-end. Maybe because I haven't been running a muffler or something, or because it's jsut a 4.6. I could definately feel it up top though.

I am waiting to see what Troyer says about the single 2 1/2" vs. single 3" with the longtubes and high-flow cats, but even now I may not run a muffler. If I do, it will be the 11" Maggie.

Seems like I remember 2 1/2" being sufficient without a power adder. I don't know. Doesn't really make sence to me that the kit goes to a 2 1/2" outlet either.

Thanks again jbrew, hopefully I can frankenstein the part from both factory pieces. I just hope they aren't $20+ a piece.

EDIT: I see the Dynatech kit is the same way. I'd hope they wouldn't sacrifice performance for ease of installation...??? Looks like the non-L kit has 1/8" smaller diameter header tubes also. Maybe that too will help the 4.6 out, and possibly better access to the header bolts. ;)

Can someone convince me I didn't waste $50 on locking header bolts? ;)