Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

slowmover · 03-07-2012, 12:08 AM

When I bought my truck the PO had removed the stock muffler and tailpipe and replaced it with an:

- Aeroturbine 4040

but the drone while towing was unreal. Had to almost (literally) yell for my wife to hear me. After reading some threads on TDR I copied the move made by several by moving the A-T forward to serve as resonator and added a

- ROKKTECH Silent Might

which has to be the best sounding muffler ever made for an ISB Cummins. Straight-thru but for 3-square holes cut at one end (large chamber surrounding pipe) in the direction indicated for "quiet" (on a quiet muffler).

The section cut out was used to replace a gaudy tailpipe tip (extends exhaust out past rocker panel several inches. Definitely a school bus look).

The exhaust system is essentially a 3.5" i.d. pipe with [2] 4" i.d. pipe mufflers.

Is it better than stock? Maybe, maybe not. But it is lower backpressure I'm fairly sure and just about as quiet but with a different sound (sharper) than the stock system.

I've thought about playing with it by adding an EAG at the mouth of the A-T as a few reports indicate better steady-state fuel burn.

.

03-07-2012, 12:08 AM	#44 (permalink)
slowmover Banned Join Date: Oct 2009 Location: Fort Worth, Texas Posts: 2,442 2004 CTD - '04 DODGE RAM 2500 SLT Team Cummins 90 day: 19.36 mpg (US) Thanks: 1,422 Thanked 737 Times in 557 Posts	Diesel exhaust system When I bought my truck the PO had removed the stock muffler and tailpipe and replaced it with an: - Aeroturbine 4040 but the drone while towing was unreal. Had to almost (literally) yell for my wife to hear me. After reading some threads on TDR I copied the move made by several by moving the A-T forward to serve as resonator and added a - ROKKTECH Silent Might which has to be the best sounding muffler ever made for an ISB Cummins. Straight-thru but for 3-square holes cut at one end (large chamber surrounding pipe) in the direction indicated for "quiet" (on a quiet muffler). The section cut out was used to replace a gaudy tailpipe tip (extends exhaust out past rocker panel several inches. Definitely a school bus look). The exhaust system is essentially a 3.5" i.d. pipe with [2] 4" i.d. pipe mufflers. Is it better than stock? Maybe, maybe not. But it is lower backpressure I'm fairly sure and just about as quiet but with a different sound (sharper) than the stock system. I've thought about playing with it by adding an EAG at the mouth of the A-T as a few reports indicate better steady-state fuel burn. .