LML Finally had enough!!!
- Thread starter duramaxzak
- Start date
I forgot to update this, I did hand calculate the fuel mileage and it came out to 21.68mpg. So the DIC is still pretty accurate and that's a 4 mpg gain!!!
For anyone looking for a quite muffler to put on a LML with delete pipes or just a loud system that you want to quit down the Nelson 86127M works very well. Just put one on my CCSB and it fits well for being 40" long. Sounds great I'm really happy with it.
I had a Walker muffler for about a year finally started to rattle after about a year. Should have went with my first choice Donaldson but the Walker cross referenced with Donaldson, ya right quality sucked..
The Donaldson PDF file tells approximately how much sound attenuation you can expect from a particular muffler, could not find that in the Nelson or Walker lineup.
I went with a Donaldson M085421 as opposed to an identical size M085171 (about 40"OAL), the M085421 has an attenuation range of 12-18 decibels as opposed to 8-12 for the M085171....I also installed a Donaldson resonator up where the cat used to be to be sure I had no drone...
Page 56
http://www.emea.donaldson.com/en/exhaust/support/datalibrary/063025.pdf
The Donaldson PDF file tells approximately how much sound attenuation you can expect from a particular muffler, could not find that in the Nelson or Walker lineup.
I went with a Donaldson M085421 as opposed to an identical size M085171 (about 40"OAL), the M085421 has an attenuation range of 12-18 decibels as opposed to 8-12 for the M085171....I also installed a Donaldson resonator up where the cat used to be to be sure I had no drone...
Page 56
http://www.emea.donaldson.com/en/exhaust/support/datalibrary/063025.pdf
The Nelson that I used is 4" straight through without a center baffle, the Donalson that I looked at with similar numbers had one. They also have a resonator but it didn't look like it would fit in front of the transmission crossmember into the flo pro delete pipes. After hearing it last night I'm not sure I would want it any quiter anyway. And zero drone finally after being straight piped for a few months. For anyone running the flo pro delete pipes follow the instructions on where to cut the factor pipe and put everything together temporary then cut the new pipe about 37" away from the first cut and use the clamps that come with the delete pipes. This makes for a stealth look by using the factory tailpipe and is almost as quite as stock until you really get after it!
Installed a resonator right after the torsion bar mount, it serves double duty as it looks a lot like something else. If I took the time I might have been able to install it before the transmission mount and obtained better drone reduction. I also installed a sock around the downpipe and the hot side pipe to further reduce cab noise, little if any turbo whine now......
=
=
=
=
=
=
=
=
=
=
Page 32 in the link I posted earlier.
5" (125mm) I.D. and O.D. - Part No. M090072
4" (102 mm) I.D. and O.D. - Part No. M090362
So far its looking like I gained about 3mpg driving back and forth to work.[/QUOTE]
It is things like this that tells me the emissions game is a whole lot of crap how could it be better for the environment by burning more fuel that isn't doing any work all this crap is just lining the pocket of people like Gore...
It is things like this that tells me the emissions game is a whole lot of crap how could it be better for the environment by burning more fuel that isn't doing any work all this crap is just lining the pocket of people like Gore...
The emissions thing is maybe part crap and you don't know until you have it tested what the numbers are. With the maximum opacity of 40% where I live my truck went from 4.5% bone stock and subsequently to 6.6% (stock tune, a few items changed)and the last being 19.0% (90hp tune)
Last edited:
You didn't get the 40 rwhp Rob said he gained? 
Seriously though, can you tell any difference vs stock?
Seriously though, can you tell any difference vs stock?
You didn't get the 40 rwhp Rob said he gained?
Seriously though, can you tell any difference vs stock?
Maybe a little more responsive, but nothing really noticeable.