Who has MBRP and G56?

[dmurdock]

I am thinking about getting this muffler, but the higher rpms with the G56 have me worried about in-cab droning. I already get a little drone at 70mph with the stock muffler so I don't want to increase that at all.

 

[Van Blom]

Wuts a G56?

 

[dmurdock]

Wuts a G56?

The new 6spd which replaced the NV5600 (unless I got the name wrong. . I think it's a G56)

 

[JCleary]

Yes, and with it's final drive ratio coupled with 3. 73's, it puts your cruising revs where the NV5600 is with 4. 10's.



I do not think you'll have any drone issues. The MBRP won't resonate like Flowmasters in a Tahoe/Suburban, but due to the nature of the Cummins there will be an increase in volume from 2000-2400 depending on the truck.



I have a Banks exhaust on my truck that got real loud at those revs. I added a MBRP muffler in front of the Banks and it is now barely audible unless you floor it. At 2000-2400 it's a bit louder, but not intrusive as before.



Your truck has a catalyst, so it will be quieter than mine. I think you'll like the sound of the MBRP.

 

[Mark Craig]

dmurdock,



Under normal crusing you'll likely not be able to hear the difference, when you hammer on it or are towing up a good incline you'll hear it some but other wise it's very mild with the cat in place. If you pull the cat it does get louder but no drone etc.



Mark @ DPPI

 

[Van Blom]

no difference in loudness, just a different tone. (even the wife likes it)

 

[msperos]

I've got the G56 and MBRP + my CAT fell off . No drone hear. It gets pretty throaty when you get on it but pretty tame on the highway

 

[Chaw]

I installed the MBRP “600” bolt in muffler a little over a week ago. The quality of the muffler and pipe is first rate. Seems to be better than the factory system. I do however have some droning issues. At 1100-1200 and 1800-2100 it is loud in the cab. If you are not on the throttle, it is quiet as stock. Lay into it, it is loud.



Not sure yet if I am going to leave it in, I did notice some drone at 1800-2100 with the factory system. I guess I am just getting old.



The cat is still installed in my truck.

 

[Van Blom]

I installed the MBRP “600” bolt in muffler a little over a week ago. The quality of the muffler and pipe is first rate. Seems to be better than the factory system. I do however have some droning issues. At 1100-1200 and 1800-2100 it is loud in the cab. If you are not on the throttle, it is quiet as stock. Lay into it, it is loud.



Not sure yet if I am going to leave it in, I did notice some drone at 1800-2100 with the factory system. I guess I am just getting old.



The cat is still installed in my truck.

I had the same problem until I retightened all the connections--drone went away