Duramax Factory muffler on my sbc 350?

[8u115hi7]

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

[8u115hi7]

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?

[DarkCharisma]

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]

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.

[IwannaSS]

a thrush welded is basically a knock off flowmaster 40. however a thrush turbo would be a lot quieter

[DylanC]

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,

[jsan2007]

Thanks for letting me know

[8u115hi7]

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