Muffler Install - Position?

[SteveAnsley]

First off, you'll can go ahead and call me an old man.



Just went to straight pipe w/ my stock exhaust on a '98 12V (man, that cat was a bit on the plugged side BTW). The gearhead in me likes the sound, but the 40 yr old in me says it's a bit too loud, especially the drone @ highway speed.



My muffler guy just left a voice mail that he's ordered a 7" FloPro.

Any recommendation as to where along the pipe is the optimal place for the muffler?

I'm wanting to mitigate any drone in the cab. Would it be better to place the muffler closer to the engine, or more towards the rear?



And yes, I've thought about a 4" system. I'm watching the budget as we have enough different projects going right now to absorb any discretionary funds.

 

[Cummins4Life]

Forward of the stock position as far as possible is the best place to kill drone.

 

[Tomeygun]

Forward of the stock position as far as possible is the best place to kill drone.

hmmm... My drone was lessened when I moved the muffler from under the cab to under the bed...



Heck, I dont know...



Course I can't hear anything over the whistle of the SP66 :-laf

 

[bmwcushman]

I put a 4" on mine-large dia straight through-droned terrible. Stuck another low restriction in front of that one-voila- turbo whistle but no drone... .

 

[98rammer]

muffler as far towards the rear of the truck, resonator towards the front of the truck as much as possible

 

[SteveAnsley]

http://www.flopro.com/FPround.htm



My muffler guy picked up a 7" round Flo-Pro yesterday, pretty impressive looking. Going to have it put in Friday.



I'm a little concerned about the muffler taking care of the drone by itself.

Would a small glasspack prior to the muffler help?

Then again I was experiencing absolutely no problem when there was just the cat by itself (it was a bit plugged).



I'm assuming the best course would be to try the muffler by itself and go from there.

 

[98rammer]

if the muffler doesn't cure the drone- or help it enough, then add a resonator as far forward as possible

 

[Mark Craig]

SteveAnsley,



We have 4 inch shorty resonators just for that problem, they need to be placed as far forward as possible to get teh best results. Check your Flo Pro system to make sure the muffler has packing materials, if it doesn't you'll be getting a lot of drone over a muffler that has high temp packing materials. Call us if you have any questions etc.



Mark @ DPPI

 

[RJPotts]

The best place for a muffler is the steel bin. Hehehe, I understand wanting to kill the drone though.

I experimented with small pieces of 90* angle clamped to the exteior of the pipe in certain places and it reduced the drone drastically, if you like the sound and hate the drone thats the way to go.

-R. J.

 

[SteveAnsley]

Alright, had the muffler installed today. Ended up putting it just about in the middle.



As mentioned earlier, it's a straight-thru Flo-Pro 7" round. The exhaust has a nice rumble now and just a bit of a roar when getting on it. Looks like it should last awhile.



The drone is MUCH better, alomost non existent. Just a little bit of drone between 1600-1750 rpm's, probably the same as before w/ the cat. I think I'm more concenscious of it now.

Might try putting pieces of aluminum angle at various spots of the exhaust, just to play around.



One noticeable difference is the additional rattle coming from the muffler, you can hear a 'can' type of rattle coming from the muffler outside the truck when it's idleing. Not a big deal, just noticeable.

 

[BigPapa]

I put my straight through Wagner as far back as possible. No drone, good deep sound. I've had several people with 4" systems comment that mine sounds better than theirs. The only place I've heard it from is in the cab.



Scott

 

[Wiredawg]

I had an IMCO performance muffler installed on my 93... has nice tone, sounds good getting on it but no drone at all. Can't hear it like my 02 (BD) or 03 (Aeroturbine), but tone is great. This bad boy is about 30" and you can see daylight thru it.



Wiredawg