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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 07-10-2019, 07:26 PM   #1 (permalink)
hhawg1
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Muffler?

Hey all. New here so please excuse any lapses in protocol. I picked up a '93 c3500 GMC crew cab withe 6.5T a few weeks back and have a question. This thing has 172k miles and tons of upgrades on it including a 4" stainless exhaust from the down pipe back. It runs great and gets pretty good mileage (18mpg) but its too loud for me. It doesnt appear to have any cat or muffler at all and I'd like to change that. Any suggestions for what to use by make or size? Don't want/need the cat though. I can stand some noise and would rather not lose any performance but my teeth have loosened up driving this truck. Thanks for your advice.

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Old 07-10-2019, 08:15 PM   #2 (permalink)
sctrailrider
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Look into a resonator, it will soften the drone a bit... if you want a muffler fine one made for a diesel, a through flow type...


https://www.ftediesel.com/store/pc/v...p?idCategory=7

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Old 07-10-2019, 09:01 PM   #3 (permalink)
kmagg
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X2 on a resonator. Will soften the harshness, but still sound good. It's what I do on my diesels. You can buy a cheap one on ebay or Amazon to try and if you don't like it , can put a piece of pipe back in its place easily with band clamps.
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200,000 miles, OPS/LP relay, new glow plugs, F style intake-EGR delete, new crank pulley, Spectra sending unit with ACDelco tank sock, new fuel & brake lines front to back, rebuilt (by me) stock turbo, new stock Bosch injectors, Heath PMD relocation with Dtech PMD, Heath fuel pump, new timing chain & crank sensor, air intake snorkel removed, new CDR, resealed engine (except head gaskets), new oil pump, Feed the Beast mod
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Old 07-10-2019, 09:04 PM   #4 (permalink)
kmagg
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Like maybe something like this:

https://www.ebay.com/itm/4-Inlet-Out...MAAOSwSn1cARCP
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1994 Chevrolet Blazer 6.5L 4X4
200,000 miles, OPS/LP relay, new glow plugs, F style intake-EGR delete, new crank pulley, Spectra sending unit with ACDelco tank sock, new fuel & brake lines front to back, rebuilt (by me) stock turbo, new stock Bosch injectors, Heath PMD relocation with Dtech PMD, Heath fuel pump, new timing chain & crank sensor, air intake snorkel removed, new CDR, resealed engine (except head gaskets), new oil pump, Feed the Beast mod
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Old 07-10-2019, 09:57 PM   #5 (permalink)
tnDan
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Also look for a factory take-off from a new diesel that someone has upgraded. Most new trucks have 3.5-4" exhaust and flow enough air to make more power than a 6.5 can.
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Old 07-11-2019, 11:06 AM   #6 (permalink)
hhawg1
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Appreciate the suggestions and links.
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