Well i finally got rid of the drone i've allways had with the MBRP duals, even with the resonator running the SPS62 the drone was unbearable, and the exhaust note was really loud.

So after searching and searching i ordered a straight thru Walker 21838 40" x 8" muffler 60 bucks from rock auto, i installed it directly to the inlet of the MBRP muffler.

The truck is quiet but still has a deep rumble at full throtle, no change in power or egt's and best of all NO drone at any rpm, in fact you can hear nothing from the exhaust in the cab at all.

 

Sweet! I want to come by and here that baby! Ps, whats the skinny on the resonator you took off?

 

For know the resonator is still on, i did'nt have a piece of expanded pipe long enough to replace it.

It sound like it did with the twins.

Rick