8-Lug Truck Performance Duramax, 8.1L, and HD tech | Intakes | Exhaust | Tuning | Suspension | Drivetrain

Factory duals Y'ed into a single 3"

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Old 10-07-2010 | 02:08 AM
  #31  
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Originally Posted by Fill
I think the gains/losses on this particular setup (cant speak for others) between 3 and 3.5" could only be measured in single digits on the dyno. Plus I think the smaller diameter of the 3" keeps the exh gas velocities up and helps out the lowend on my heavy *** truck.

Just so everybody knows too, the Pacesetter ORY is reduce from 3.5 down to 3" a couple of inches forward from where the intermediate pipe meets the ORY pipe. That said, a couple 45's and about 6 feet of straight and this setup could easily be upped to a 3.5" system. Of course I would need 2 new mufflers.

I'll try and get an interior and an exterior video made soon. It sounds really good though.
true about low end , but imo a tune will give more with a 3.5 even low end tq wise

you have a 6.0+ bolt ons youll have an overall better power band

youll build up alot of backpressure with that setup, and if that was a bigger exhaust you could retard the timming just a littel more.

thats just me seeing that you dont loss any low end with a 5.3 or a 4.8 with 3" and dual 2.25" exhaust systems

also a two muffler set up will slow the flow and increase unwanted backpresure i think the only benifit will be "faster" engine braking power
Old 10-08-2010 | 01:00 AM
  #32  
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sandman, Im always open to input, but we're just going to have to agree to disagree I guess.

Anyway, here is a vid i made today of a couple different runs from inside the truck. Ill work on some exterior vids.

All in all, for a non-catted system w/ longtubes is relatively quiet inside the cab.

Old 10-08-2010 | 01:01 AM
  #33  
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hmmm that didnt work. Anyone know how to embed a photobucket vid?

****EDIT, nevermind
Old 10-08-2010 | 08:22 PM
  #34  
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the truck realy sound good.........congrats on the finishing project.
if you can get a custom exhaust set up with out a drone that would be an accomplishment by its self. espiecaly with long tubes
Old 10-15-2010 | 12:51 AM
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sounds good.
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