i responded to that post a while back. u didnt see it?

the ebp sensor is before the turbine, so it regulatesthe manifold press

 

musta been the cat..... mine will break eardrums w/ the whistle. all the kids in town know to cover their ears when they see my truck

 

Nope, the non muffled exahust was just too loud for the turbo whine to be heard...
all you heard was just like any unmuffled big V8 !

 

Mine's straight piped - 3.5" downpipe to 4" out before rear tire. Baddest sounding exhaust note in any street vehicle I've heard. The whine is insane! Sounds exactly like a jet. Lowers egt's if your chipped. More power too. Can be annoying for the neighbors.

 

Cat back does not effect your warrenty

 

Some people were overspooling with the complete exhaust and dealers were giving them a hard time about it,dealer told me there would be no problems with the cat back system.

 

Sorry bighoss, didn't see it. But, according to the 6.0 Bible, page 32, the Exhaust Pressure Sensor is in the exhaust stream. Before the turbo, it reads there is the Mass Air Flow sensor and Air Intake sensor #1 before the turbo. In the "Air Management" section there is little reference to the ebp sensor but lots of reference to exhaust back pressure and it's affect on turbo performance and for engine warmup. You in cold climates take note. Appropriate back pressure seems to play a big role in the tuning of this engine.

Nccpartsman, where did you see the dyo tests. I think it is worth investigating.

 

I have the Hog 4" turbo back ( bought it from motorhaven ) it has quite a bit of turbo noise but sounds good when pulling hard, I would have thought that the bigger companies would have tested the 3.5" vs 4" DP and stuck with what worked, I'm trying to figure out how backpressure after the turbo would effect the way the engine worked, I could see a problem with to much restriction, but an exhaust that flowed to good, I've never heard of such a thing,
if you stop and think about it (common sense wise) I would think that the sensor reading a fair amout of backpressure would adjust the turbo to boost more because of the lack of flow, now if you have an exhaust that flows well with less back pressure the turbo would simply adjust to create the same boost,
maybe I'm way off base (or not even on the same field) just something to think about,
npccpartsman, did the other website even offer a 4" DP or were they just hyping the product they sell? just wondering.

 

the sites I searched were shopdiesel, portadiesel, bullydog, and quadzilla--that's all that had the exhaust at the time (at least all I could find) but I can't find that information anymore. Yes, they did offer the 3.5 and 4" downpipes and I believe the comment that they made was that the 3.5 made more power quicker than the 4 and there were no noticeable differences in egt's. Of course this was relatively early in the game and all that info might have changed. I've searched extensively and can't find that information anymore so maybe it was bogus or just sales hype, because I do remember that they were pushing plug-in chips and not flash programers since there were none available at the time. I'll search more when I have time as I'm interested in an exhaust that's factory quiet and still provides the necessary heat protection for the vital parts. I was also wondering if anyone makes indash gauges that actually work and are more than glorified idiot lights---maybe with a cool looking backface with numbers for oil pressure, trans temps, etc. I like to keep the sleeper look going as much as I can, but I hate those gauges --they're really useless.

 

Every performance shop I have talked to so far (Quadzilla, Diesel Innovations, and Diesel Performance Specialists) Have said that the 6.0 needs a 4 inch downpipe for maximum performance. That is what I have been told, nothing more. Between disconnecting my EGR, and installing my 4 inch Hog exhaust has nearly eliminated my turbo lag.

 

My point precisely. Maximum performance. Don't overspool that turbo though! Plus performance shops are in the business of selling product and would love to sell you another turbo.

 

Again---this is what I read months ago and it was on a website where someone was selling something--just my $.02--lol--I won't argue the logic about the 4" versus the 3.5"---lots of variables with every situation. The last reflash for my 04 (still waiting on oasis report) virtually eliminated my turbo lag and that was without the predator. With the predator it's really quick and driveability is excellent--tranny shifts firmly but not overly hard. Virtually eliminated ALL the complaints my wife had about being stranded in front of traffic at critical intersections where she would punch and NOTHING happened. Now it's punch and burn the tires--no back braking necessary. I searched for what I read and have still not been able to find it again so it's probably been removed and may have been inaccurate anyways. Portadiesel.com or Shopdiesel.com is where I'm sure that I read these dyno reports, but they're not there now--and it may have been where I went to the websites of the products that they sell. I searched so many and it was months ago I wouldn't swear to where it was but I know I did see it at one point. Since then the Predator has arrived in all it's glory and I haven't looked that hard for exhaust because I'm not pulling heavy loads (4000-5000 lbs max) and it's not a priority in my budget yet. I hope someone can verity what I read, but if not then I'll leave it up to our resident researcher SBV as he seems to have great success at this and maybe he can give me some lessons when I get to Austin!!!

 

Let me know when you get settled in!

 

I posted my theory on larger exhaust down pipe being a potential problem on flatratetech. They said I had it right.
Something to think about.

 

Is flateratetech a website? What is your the theory?