I have 06 GMC LBZ with a deablo sport tuner, I pull a lot of heavy equipment. I want to upgrade the exhaust system but not sure what would be best, cat in or out and 4 in or 5 in, can anyone help

I am a Cummins dude but will assume that this knowlege will apply to a Max as well...the less the resistence the better.........someone back me up on this for the D-max though

here is some exhaust information in general that is very interestimg

Exhaust size comparison

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I'd get rid of the CAT unless you are in an area that requires visual inspections or opacity tests for emissions. 4" works just fine until you start pushing over 500hp at the wheels.

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1994 Dodge Ram 2500 CTD, DTT auto, #100 plate, 370s, alil bit of timing, BD Super B Special, 4" exhaust to 5" Aussie stacks, and an AFE PG7 intake.

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I went with 4" fromt he turbo back(so they call it). I would go catless

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The biggest EGT drop will be from a Catback ya gain a little more losing the cat and if you block off the EGR, but you could set a CEL more likely if you do the cat and you will set a code if you block off the EGR. I would just cut out what ever you want muffler/cat and get some pipe from a muffler shop. The codes can be avoided with a Finger stick and removing anything other then the muffler could cause you some trouble at the dealer.

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I went with 4" straight pipe egr blocked and fingered. It runs wel, without a load and ppe hot+2 level 3 at wide open my egts only go to about 800*.

redneckbuckeye's Sig:

Nate
2006 2500HD LBZ D/A ext cab Greystone metalic- autometer z-series pyro and boost gages- Egr blocked and fingered- turbo back 4" MBRP, with muffler delete pie exhaust(lost kitty )
265/75/16 Firestone destination MTs . Tie rod sleevesPPE hot+2
Coming soon BD Max flow lift pump

Where do you have your pyro?

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800 would be a post turbo mount

It is mounted pre turbo,this is a pic http://dieselplace.com/forum/uploads/CF8_installed.jpg

I think you have something wrong with it then because 800* is way to low. I wouldn't be surprised if you shouldn't be able to bury at 1600* pyro with the Hot. How many HP is level 3 and what are your cruising temps?

Level 3 is 160hp at the crank, i may have mis represented a little cruising at75-80mph around 800* I never do WO 0 - 80 or 90mph, I don't go wide open through 4th 5th 6ht because my tranny needs to live for a while. Still I have done hard launches like I said above not all the way through all the gears but my gage has never read more than 800* that I have seen. Sorry for the confusion and i did not mean to mislead.

Never mind that sounds right

How do you keep your EGT'S so low. With Triple Dog on performance I've seen as much as 1250. Performance is supposed to be around 85 hp at the wheels.

Get you the MBRP cool Dual turbo back, I had those on my 05 and they were very nice. Not too loud just a stock like sound.

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He does most of it with his right foot, but 1250* is nothing to worry about. I see that on a little hill while towing.