ok so it seemed like a good idea at first,ive always like the chambered mufflers, i put a 3 inch intermediate pipe on my 06 5.3 rcsb with a single chamber fm on the end with about 8 inches of pipe after it to a dump right before the axle. now it sounds great and believe it or not its not really that boomy,more of a really deep grumble, not nearly as bad as a 40 series. and when you get on it its really loud, it right out screams, but with my 3.42 gears i cruise right at 1500 rpm at 55 ugh the peak of the drone and now would like to kill it, but without losing that loud top end scream and still sounding like a chambered muffler. so i have an idea and some pics

ok im not sure what type of muffler this is, i thought it was a magnaflow, but i was wanting to put it in front of the single chamber to quiet things down a little or should i just have it installed and lose the single chamber all together? oh and the straight throught muffler is almost 23 inches long at the case.

 

It looks like a magnaflow, or a copy of it. you could try that muffler alone, but it might get a little raspy. I have a 14" magnaflow and pacesetter lt's with an ORY, and it drones bad at 1800 rpm. You can also try to add or remove a foot of pipe in your existing setup and see if it helps with the drone. I heard drone is more of tuning length issue than a muffler isue.

 

yeah i think ill try putting that one inline before the flowmaster and see how it sounds, since i dont think it will hurt performance any being straight through ... im hoping it will absorb all that 1500-1900 resonance, oh and btw on these type mufflers do they have a specific inlet/outlet like a chambered, or are they reversible?

 

get rid of the cats. if you want loud you will be really happy. when i put the LTs and ORY on mine i lost a TON of drone on the highway which was an unexpected benefit.

 

i would absolutely love to lose the cats and put some long tubes on it, but im in cali and have to have that **** for smog

 

you could try going full length with the exhaust. it would take it away from the cab. IMO that single chamber flow is still alot of the reason you have drone. try that magnaflow xl muffler you have. i have a gibson super truck exhaust but i had it repiped after the muffler to straight back to the axle and dumped.its pretty quiet until i really give it gas. and i noticed a difference in acceleration between my old flowmaster and this gibson.

 

would you think that if i just replaced that single chamber with that magnaflow and a dump after it would kill the resonance, or would i need to go to a full length kit?

 

i would loose the FM personally, but at the very least run a 3in tail pipe out the back and exit in the stock location, with a nice chrome tip it will look good, and it will still sound bad *** at WOT and you will loose the drone at cruising speed.

 

I would just run pipe over the back axle and aim at an angle down....that should help cut out some of it....or atleast get it further away from the cab so you dont here it as much

 

i ended up just chopping out the flowmaster and putting in that magnaflow and a turndown and thats all it took, no more drone, whatsoever, at any speed, at any rpm.