Straight pipe on a NHC-250

[woodywood]

i think the duals are kewlopcorn:

 

[m139h2otruck]

We had a 580 Case tractor-backhoe with a straight pipe up through the hood, was so loud that you could hear it 1/2 a mile away on a calm day. And this was only on a little 188 nonturbo engine!!

 

[beaubeau]

I have been driving a 1997 Dodge 2500 W/ Cummins, 5spd. since 1997. I removed the muffler in 1998, not too loud, I gained 4MPG and it sounds great! There are Shorty mufflers or a Resonator that can be installed in an M818 instead of original muffler at a much cheaper price, like $36.00. A Cummins with a LONG strait pipe sounds great, as long as it is Behind you. I make my Stacks from used Drive shafts. Solid material, and easy to weld. Phil

 

[Big Mike's Motor Pool]

i thought i heard somewhere that EGTs didnt much matter on N/A engines. you can turn the fuel up on them all day long and do no damage. am i wrong??

 

[quarkz]

beaubeau,
Do you have any more info or part #'s on the 'Shorty mufflers or a Resonator that can be installed in an M818 instead of original muffler at a much cheaper price, like $36.00'?

 

[Alex400]

IMO, to lower egt's effectively you must increase the flow in and out of the engine. Make a more open intake, or more efficient intake with a larger exhaust from the (in this case) the header back. I don't know what the stock is on a 5 ton, but maybe a 4" or 5" with a high performance muffler. I wonder if you could even fit a Hushpower in there.

http://www.hushpower.com/product/10/PRO+Series+Mufflers.html