Finally got my 2500HD exhaust finished this weekend. My idea to run a 36" Walker diesel style muffler was a flop. It didnt knock down the rasp/drone at all. I ended up running two 16" straight through Magnaflow type (Actually called Bullet) mufflers in series.

It is actually quieter then the Magnaflow that I had on there that was dumped. Absolutely zero rasp and very very minimal in cab drone.

What came off (OEM 6.0L manifolds/dual piping/Magna dumped)......

What went on (Pacesetter and ORY to a single 3" all the way up over the axle and out the back).....

 

Exh pics...

 

I had a duramax stock exhaust on mine holy crap was it quiet. So how come you are running 2 mufflers now and single pipe?

 

There is literally nothing out there, exhaust-wise, for 6.0 trucks except for cat back systems and I wanted something with more potential.

The factory duals arent really necessary on a truck making under 350HP either. So far my motor seems to be responding better to the non-catted single 3" anyway.

The dual muffs were keep the sound in check.

 

Ah ok

 

3.5

3 is small

 

Maybe for an all out race truck, but this is a 300RWHP (maybe) daily driven truck.

My logic was that if the new 6.2L rated at 403HP at the crank does its business with 3.5" single tri-catted piping, then I can do what I need to do with just a single 3" non-catted system.

Made perfect sense to me and Justin (Blackbear)

 

i can debate with you but not with Justin

i have a 2009 5.3 sierra obx long tube headers with 2.5 colectors and 2.5 ory into single 3" exhaust spliting after a magnaflow 36 " xl muffler

if i would do it agine id go with a 3.5" just to be ahead of what i need

thats my opinion

 

nice set up, cant wait to hear how it will sound with two muffs

 

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.