Some of you know i had been considering going to a 6.7 because i haul a 15k 5th wheel now. decided for now to stay with my ole trusty 6.0. Ive been looking at ways to help manage the EGT and was considering a exhaust and possibly bigger turbo. Currently I have stock pipes with the CAT removed and a Walker BTM muffler on it. It sounds fine as I dont really want the drone or loud truck while towing. I see 4" is really popular on the boards but what about while towing? I guess I could go 4" and another Walker type muffler? What do you all think?

DW

 

I'd stay with what you have for a few reasons...

Turbo lag- when you go from a 3 inch downpipe to a 4 inch downpipe, it takes more time for your turbo to spool leading to a lag when you step on the pedal cruising or from a stop.

Torque-When you go to a 4 inch downpipe, the torque you bought the diesel for is now higher in the RPMs. With the 3 inch downpipe, it doesn't take much to spool the turbo to get and keep the load moving. With a 4 inch downpipe, it has to fill the downpipe with enough exhaust and back pressure to spool the turbo before you can build the proper torque you need and the engine was designed for.

Fitment issues-I've noticed that alot of people myself included have had fitment issues with the 4 inch downpipe. It tends to rub and rattle in certain spots, but depending on the kit, it may not. I learned this with my 4 inch downpipe, it never did fit right and would rattle against the spring shackle.

Performance-Though irrelevant to your situation, I managed to put down 411hp and 756 torque on Gearhead's SRL Extreme. My buddy who has an '05 F350 SRW 155/30 injectors, Atlas 40 FICM, Stage 2 turbo, and a huge exhaust, didn't put down much more than I did. That pissed him off, but it got the point across that all the overkill he put into his truck didn't make too much of a difference.

I learned all this from my experience with my truck as well as from one of the two engineers who wrote the programming for these trucks. He confirmed alot of what I learned and gave me alot of insight on getting these trucks to perform their best. So if you're concerned about EGTs, the most I would do is a cat back exhaust with a cat delete.

 

What kinda egt you seeing now on a hard pull?

 

When I got my X it was stock with 13k miles. I had bad and inconsistent hesitation. Pulling out in traffic was a challenge. So I removed the cat. Got a lot better. Put on an MBRP SS turbo back 4” exhaust with muffler and no cat. Since I did that 11 years ago I have never had any turbo lag. In fact my turbo is constantly turning. When my truck is idling, it sounds like a running APU on a commercial airliner. All it has to do is adjust the vanes to provide the requested boost.

I belleve that is the reason why the 6.4 had twin turbos. The small one kept the big one spinning so there was no turbo lag like the stock 6.0 had.

Ed

 

ive seen around 1100-1200 egt when accelerating. I live in Texas and mostly flat ground. we like to go Colorado etc... PSI on the turbo only gets around 22-23 too

 

I have 4" turbo back, 2 straight thru muffs to tame the whistle, egt's stay 1100 or less towing on hills and 800-850 on the flats. VGT% sits around 70% at idle and the truck comes alive the minute I touch the throttle. ECM strategy is rolled back and I run Atlas 40.

 

Is the atlas 40 better than Matt’s tow-tune?

 

The Atlas 40 goes on the FICM, Matt's tow tune goes on the PCM.

When used together, the truck responds much better, but you have to watch EGTs when towing heavy unless you have an upgraded turbo to keep things cool.

Case in point, I used a buddy's '04 F250 to tow a friends Mercedes Benz home from the dealer. I towed with SRL Extreme since he didn't want to change it, but with his Stage 2 turbo, EGTs never went past 1100 degrees.

 

Do I need to have Matt rework his tune or just add the Atlas? Also which turbo the Garrett power max? Would I use that with the 4”? Or stock pipes

 

mbrp has a 4in with a 3.5 in down pipe when towing you don't notice any extra lag couldn't tell you egt but I would think it should be quite a bit lower

 

Thats how mine is,but straight to the back, sounds off pulling heavy on hills.

 

Do you find the mbrp too loud for towing?

 

I run a 4" turbo back and tow a 16k 5ver and it is not a problem at all, I found a drop of 300 degrees on egts on average.
You have no extra lag, no loss of torque. Back pressure on turbo engines is 2 fold you have pre turbo which does not change at all with a larger turbo back exhaust as your turbo is the restriction and you have post turbo back pressure and the less the better. On Natural aspirated engines you can definitely tune your engine for a RPM range by sizing it for maximum velocity/flow.

 

I'd say I'd make darn sure that 6.0L had the necessary engine mods before subjecting it to anything "on the upper end"...............5th wheels are "easier", but but but even without tunes, those FORD LOUSY HEAD BOLTS can go "loosey goosey" in a major way............

 

Its not to loud for me but you could always try straight and if to much go add a muffler of sorts that dont restrict so much.