diesel muffler compared to gas muffler - Diesel Forum - TheDieselStop.com
E-Series Vans Technical discussion of topics related to vans powered by any of the Navistar engines. This covers a broad number of years, but there isn't enough demand to split it any further.

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post #1 of 2 (permalink) Old 03-05-2007, 11:51 AM Thread Starter
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diesel muffler compared to gas muffler

I am not trying to alter the emission system. My question is usually on a gas engine, just changing the muffler would not make a noticeable increase in power unless you installed headers as well. Is a diesel system different in that respect?

1998.5 E350 7.3 extended cargo with Late model doors ,power windows, locks and mirrors.Isspro gauges from DPPI, Power Slot Cryo rotors from DPPI, Hawk LTS from DPPI,NAPA DOT 4 brake fluid,NAPA calipers,Evans coolant,Dieselsite ac control valve,Dieselsite 203* thermostatat,,Amsoil dual oil filter, Rotella T-6 full synthetic oil,4 inch Warpspeed Performance exhaust,Thermo-Tec Exhaust Insulating Wrap, Bilstein shocks,Line-X 2-06-2009 103,400 miles following added Beans stage II single shot injectors, Air Dog, Beans regulated fuel return with fuel bowl delete, glow plugs and Stancor gp relay, Beans modified IDM, Stealth HPOP stage I, Dominator 66 turbo, DpTuner reflashed factory pcm that was split shot injectors to the single shots, 9 tunes from DP Tuner including decel tune,tuflocs on all doors, Snow water-methanol injection stage 3 installed by Beans Diesel, BTS tranny installed on 4-29-2010
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post #2 of 2 (permalink) Old 03-05-2007, 03:35 PM
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Re: diesel muffler compared to gas muffler

You are correct that just changing mufflers will not result in a noticable increase in power, Gas or Diesel. That being said the factory Ford muffler is an Offset internally baffled muffler to help make it quiet, but is also restrictive.

Exhaust restrication in a diesel can result in higher Exhaust Gas Temperatures (EGTs). If your keeping the van stock, changing the muffler to a straight thru style (you can see through it) will give you lower EGTs and perhaps slightly faster spool on the turbo. It will also be louder.

Headers for turbodiesel are pricy and have limited effect since the turbo is between the headers and the exhaust (good for people trying to get every last bit, not necessary for average joe)

If you plan to chip or modify you definitely need a straight thru muffler at a minimum to keep EGTs in check. An EGT guage is a MUST if modding. As someone else mentioned in another thread, hopping up a turbodiesel is easy, just add more fuel... this also adds heat that has to get out. For mild modding and chips up to 80HP boost, the walker BTM in place of the stock muffler should be fine. Depends on your program/programmer/tuner. Jody at DpTuner I think has the most experience writing Van Specific Tunes if you want to go that route.

If your keeping the engine all stock, keep the exhaust stock unless you just like the noise. The '03 I just Sold, I replaced the stock muffler and tailpipe and a portion of the midpipe with 4" exhaust and muffler.Left Down pipe and midpipe stock. Never chipped the truck. While I liked the noise around town and seemed to give slightly better throttle response, There were no verifiable gains including MPG to justify the extra noise. On the highway at speed there were certain rpm ranges to avoid due to what I consider objectionable droning.

I was modding to mod and had fun doing it, but had the van not sold the stock exhaust was going back on before my next road trip.

People (Vans) with the Walker BTM 3.5" mufler in place of there stock muffler so far have not reported any Drone issues. You may or May not have drone (I did ) using larger diameter components or Aftermarket components.


2000 E-150 Club Wagon Chateau 4.6L V8 4th Club Wagon

Other Fords Gone:
1999.5 F250 CC SB XLT 4WD, 7.3 PSD, First F,2nd Diesel, nice but still liked the van better.
2003 E-350 Super Duty Chateau (Club Wagon)7.3PSD, 3rd Club Wagon,First diesel, Never should have sold it....
1996 Club Wagon Chateau Heavy Duty 7.5L (460) V8 Pass anything but a gas station, Traded it in on the '03
1992 E150 Club Wagon Chateau 5.0L (302) V8
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