What makes the difference between a 51" and 34" Donaldson muffler?

Thanks Jamie

 

17 inches.

 

I've heard that the 51" will be quieter.

 

What's the difference in performance, if any, and it only makes sense the bigger one will be quieter, but does it restrict air flow compared to the smaller one?

thanks

Jamie

 

There has been a lot of talk about that on the forums, but I don't really see how there could be any noticeable difference in performance as both mufflers are straight through. Just my .02
Mishkaya

 

There is a 26" Donaldson also. Smaller costs more. They're $76 at your Freightliner dealer whereas the 40" was $56.

 

I really don't want to go much louder than stock during cruising speeds 70 and up. which one is suggested?

I'm ready to get one, I just want to make sure I get the one to fit my needs.

a. all the performance , air flow, decreased EGT's, improved mileage, ect.

b. not much louder than stock

I'm also not having much luck on finding one locally. My cummins dealer quoted me $101 for a 51 inch nelson. I would like a Donaldson, it looks like I'll have to order it online none of the big rig shops around carry/or order them.

OT-OF-HERE do you have a phone # by chance of the Freightliner dealer you have experience with.

Thanks, sorry for the wordiness.

Jamie.

 

I don't mind at all getting the tn, but surely there is a Freightliner dealer closer than ST. Louis to you. If you still have no luck, let me know but don't forget shipping costs. Also I really recommend the 26" since the whole bottom of your truck isn't muffler that you don't need to control exhaust noise. Mine does fine and it's just a tad over stock noise wise. Also straight in and straight out for easy mounting,..no offsets.

 

Lots of Freightliner dealers in Florida. Click here for the list: http://www.freightlinertrucks.com/fr...ults.asp?sc=FL There is even one in your town, Ocala. Number 10 on the list.

Also, there are two Donaldson distributors in Ocala:

FL, OCALA: C K POWER PRODUCTS CORP
100 SW 52ND AVE OCALA, FL
phone:352 237-7660 fax:352 237-0855
• Engine and Vehicle • Exhaust and Emission

FL, OCALA: CARQUEST DISTRIBUTION CENTER (call your local CarQuest retail store)
1700 SW 38TH AVE OCALA, FL
• Engine and Vehicle • Exhaust and Emission

I wouldn't hesitate buying the Nelson if that is all you can find. They are essentially the same design. Good luck.

 

My muffler is 0"

 

If you don't want it much louder than stock, I'd stick with the 51". That's what I'm getting. I tried a 30" Magnaflow, it was too loud and resonated too much for me.

 

Thanks AK RAM... I'm on it!!!

Monkeylips or anybody... is the 51inch still louder than stock.

Thanks, I'll probably have time to pick one up Tuesday, If my local Freightliner has one..

Thanks Jamie

 

What is a muffler?

 

for what its worth,i put a 40 nelson on my 96 with a big exhaust 4 inch[no cat]and it sounds great,and at cruise up to 90 or so its barely noticeable,and really smooth..compared to stock,i really believe,at least to my ears,its smoother,sounds much better,and no louder to me!!!!p/n 86127n nelson,about 60 bucks!!!!

 

I've got the 51" Donaldson and like it. It was kinda strange when I first installed it. The sound when taking off was real airy with no rumble, but after about 500 miles it sounds a lot better. Even a buddy of mine asked if I changed my muffler again. Deep rumble at idle. I have a resonance at 60-63 mph, But no big deal. It is real quiet on the interstate between 70 and 80. At 85 it really comes alive, sounds like a peterbuilt!