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I have been considering getting one of these replacement manifolds from BD. Is it worth $300?? I would like to hear some success stories guys... help any with the outrageous EGT numbers?? Thanks!!
 

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I dont have any comments on the manifold, but if your looking to lower egts, you might want to consider a ppe boost controler or a kennedy diesel boost stick to raise the boost levels. i ran a boost stick for a while i got an average 150* drop in egts while running a edge stacked with a predator programer. The added timing of the programer also helped lower egts also.

What kind of egts are you seeing?
 

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Those arent to bad, the dmax stock will hit 1300+towing? Towing i run no more than 1200 but other than that i really dont pay attention to the gauge. Ive seen it come down from 1800 at the track though!!!! With my current tuning i max at about 1500. High egts for short burst arent bad but getting them up there and keeping them there is bad.

What power level do you see these at? A boost adder to get the boost up to 28/30 psi will keep them in check but still the more power you run the higher the egts will be!
 

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It takes about a 1/2 hour if you good with this type of stuff but isnt hard if your not, the only thing thats hard is you have to loosent the ac compressor and push it aside, leaving the lines hooked up of course!boost stick involves no more than that. The PPE controler has a switch and a knob that need to be mounted in the cab so you would have to run a wire into the cab.

If your using your edge as your boost gauge you might want to go with the stick as the edge wont read the higher boost ( above 22/23 psi)levals since it fools the signal it uses for boost! With the controler you chance over boosting as it will raise the boost over 32 psi if you turn it up to high. The stock turbo can go boom if pushed over 33/34 psi!
 

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hey i have a ppe boost controller on my lly and with the stock turbo i'm running up 36 psi,before i put the boost controller on i had the truck at the dealer for updates and he told me the turbo was pushing 34.5psi.p.s. how long will a stock turbo hold up to that kind of pressure?
 

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it really barks when it is at full throttle and you let off of it,and it spools faster then it did stock.defently worth it$$$
 

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stock the ecm limits boost to 22/24 psi of boost no matter what tuner you have on the truck, the boost stick is about 100bucks and will raise it to about 28/30 psi depending on how much fuel you add with tuning! the boost controler will raise up to 40psi with the turn of the knob.

YOu do not want to push the stock turbo over 34 psi at all, it will pop. its not if its just when! THere has been lots of dyno testing done by folks and there is no benifit to running more than 30/32 psi with the stock turbo, any more than that the turbo drive pressure is outragious causing your egts to go back up and power to go back down!

Kennedy diesel is the only one who sells the boost stick, and any ppe dealer will sell there controler.
 

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Hey, back to the original question...I literally live right across the street from the main BD shop in Abbotsford, and I talk with the guys pretty often. The stock exhaust manifold has a "notch" in it, reason being the DMAX was actually designed to fit into the old, box style body, and the steering column was in the way, but that's not the case now because of the changed body style. The BD exhaust manifold is straight through, no notch. The stock manifold on the driver's side only flows about 80% of the exhaust that the passenger side does. Simply put, GM hasn't changed the mold for the one manifold since the DMAX was first manufactured. You can get more info on the BD website at Diesel Performance | BD Power
 
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