lookin at purchasing donaldson muffler, currently have 2006 4in without cat with mbrp muffler and its too loud and i hate the drone. i have heard that donaldson muffler is the way to go. i want:

stock quiet(close to it without any drone)

good airflow(nothing that will be worse then stock)

will bolt right into place under my truck.

also are the donaldson muffler's a straight hookup, like is the inlet and outlet the same level, or is it staggered like stock exhaust?

thanks-p0wd3rp1l0t

 

also there is a 40" and 51"...i have 4 in exhaust so would need that of course. but which one do you recommend? also truck is not chipped, no aftermarket air intake(thinking about whistler ****** diy intake) just want the best flow that i can get without the noise

 

I have straight pipe turbo back with a donalson 51" still sounds great and I can tow with out a headache.Go to ryder fleet products I think mine was 80.00 including clamps.Its the same muffler thats on my semi.

 

Truck dealers and truck parts houses have them. They are really common and there are a lot of different sizes.

I wanted minimum restriction and I wanted to send the pipe out in front of my rear wheel, so I got the 31" model with 5" in and out and a 9" diameter (they also come in 10"diameter). Slipped in a couple of reducers to 4".

30.9" overall length, 26.5" body, 9" diameter, 5" in and out.

The 5' ones are nice because they are 5" all the way through and the baffling is lower restriction. There are also different interior designs.

Also be sure to get the band clamps instead of the traditional U bolts.

Mine is a bit louder than stock at low speed, but almost silent in the cab at highway speed. It is quieter than the MBRP muffler I took off. No drone. It is also a very short pipe so that adds to the noise and the turbo whine. If the pipe went out the back it would be even quieter.

 

wow thanks bishgeo-u saved me like $55 by going there. everyone else wanted 130+shipping i got it $95shipped

now i will be ordering needed parts for my ****** whistler intake and have a sheet metal box made to keep waterspray out