View Full Version : Duramax Factory muffler on my sbc 350?
02-28-2012, 11:27 AM
i found locally a complete duramax exhaust from an '03 and was wondering how much quieter it is compared to my fm 40s
its a sbc 350, no cats into flowmaster 40s and its loud enough to give you a headache when driving
has anyone used a duramax muffler on a no cat sbc 350 before?
im trying to get it as quiet as possible
02-29-2012, 10:21 AM
i searched a bit to try and find more info about the duramax muffler, and some people say its basically a straight through design...
is it like a glasspack or something?
02-29-2012, 12:04 PM
This whole post is me being an idiot and trying to answer forum questions while working.
It's pretty quiet on a Duramax, I'd imagine it'd work well for your SBC 350, but you'd have to convert from 2.25 or 2.5" to 3", which is the stock OD for the inlet/outlet on the Duramax muffler.
1988 GMC 355
03-03-2012, 10:40 AM
You can get a cheap muffler that will be much quieter than your flows now for $35, Thrush Welded's are nice. What is the price on the duramaz muffler?
THey are alot bigger and heavier too.
03-04-2012, 08:54 PM
a thrush welded is basically a knock off flowmaster 40. however a thrush turbo would be a lot quieter
03-04-2012, 08:59 PM
thrush was around way before flow master fyi and are owned by walker : )
Flow master is a over used brand/name
I my self use thrush products
If you like your flow master and want it to be a bit more quite add a high flow cat,
03-05-2012, 02:01 PM
Thanks for letting me know
03-19-2012, 11:23 AM
yeah, i know adding a cat will definitely quiet the whole system, however the truck didnt come with a cat, nor is it required in this state for emissions
what i ended up doing was making a hoop and bringing the pipe over the axle and out the side
now it sounds just alittle louder than maybe a factory muffler
originally i had the 2.5" pipe going into the flow40 and dumped it just before the axle... even with my old 2 flows inline, the dump made the truck sound like there was no muffler at all!
so my simple solution was to simply add some pipe length
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