Need it as quiet as possible without choking the flow

[iamdub]

maybe we need to think outside of the box here!

https://i.ytimg.com/vi/Qwg7YC1Un-4/maxresdefault.jpg

When @randeez mentioned "time for a spinney muffler" in my build thread, I didn't catch on to what he meant and Googled it. It was about 90% of those Gatling gun tips. New to me!

 

[iamdub]

Have you looked into any high-flow cats?

Actually, I looked into two cats a few minutes ago, literally. I found two Magnaflow cats salvaged from a past project that I had forgotten about. With them was the Tahoe's factory resonator from the tailpipe. The cats are a bit undersized at 2.5", but I considered something. Follow me here:

Going from the front and working rearward, the header's Y-pipe merges into one 3" pipe. A merge Y splits that 3" into two 2.5" pipes. Those two 2.5"s go into the two cats positioned side-by-side. Another merge right after the cats brings the two 2.5"s back to a single 3". The muffler will be immediately at that merge and the exhaust from there is just as I currently have it now.

Of course, the cutout will be inline, ahead of this route, immediately out of the header's Y-pipe. I omitted it from the above explanation to reduce confusion. It will just be a 3" pipe that runs out of the cutout, parallel to the cat/muffler setup then curves back in after the muffler to exit out of the same tailpipe.


My only concern with the cats is, while they should return the sound (and smell) I had before, they'll be much further down the exhaust stream than where the factory cats were located. They may not get hot enough to burn off the hydrocarbons and eventually clog. My counterargument to that is with how little I drive it, they may still give me years of use before they clog, if they ever do. As always, rolling dice...

 

[swathdiver]

Actually, I looked into two cats a few minutes ago, literally. I found two Magnaflow cats salvaged from a past project that I had forgotten about. With them was the Tahoe's factory resonator from the tailpipe. The cats are a bit undersized at 2.5", but I considered something. Follow me here:

Going from the front and working rearward, the header's Y-pipe merges into one 3" pipe. A merge Y splits that 3" into two 2.5" pipes. Those two 2.5"s go into the two cats positioned side-by-side. Another merge right after the cats brings the two 2.5"s back to a single 3". The muffler will be immediately at that merge and the exhaust from there is just as I currently have it now.

Of course, the cutout will be inline, ahead of this route, immediately out of the header's Y-pipe. I omitted it from the above explanation to reduce confusion. It will just be a 3" pipe that runs out of the cutout, parallel to the cat/muffler setup then curves back in after the muffler to exit out of the same tailpipe.


My only concern with the cats is, while they should return the sound (and smell) I had before, they'll be much further down the exhaust stream than where the factory cats were located. They may not get hot enough to burn off the hydrocarbons and eventually clog. My counterargument to that is with how little I drive it, they may still give me years of use before they clog, if they ever do. As always, rolling dice...

Hmm, what did Ken do again? He's running shorties and a catless y-pipe? @kbuskill

Should make some more torque though.

 

[Rocket Man]

Saw the title and thought “tie her up and use a ********” but then I read a bit...

 

[Tonyrodz]

Saw the title and thought “tie her up and use a ********” but then I read a bit...

Great minds think alike. I saw the title and I was like...Wtf.....


Carry On.....

 

[Dantheman1540]

Not sure if vibrant ultra quiet resonators have been mention but they are awesome. Straight through design and they can survive any abuse. I suggest using a big muffler and then 1 or 2 vibrants to dial it down to your liking.

 

[kbuskill]

Hmm, what did Ken do again? He's running shorties and a catless y-pipe? @kbuskill

Should make some more torque though.

Yep, shorties and a custom 2.25" Y-pipe, to regain the lost torque from getting rid of the cats, into a 3' Magnaflow XL 3 chamber muffler and then factory tailpipe and resonator to kill the drone.

 

[ivin74]

Could you feel any change in power?

Not at all

 

[swathdiver]

Chris must still be test driving that 6.2 Tahoe for sale near his home.

 

[iamdub]

Chris must still be test driving that 6.2 Tahoe for sale near his home.

Nah. I'm not looking for a car note or to start over with modding another one. I've already invested too much into mine that when it's time for more motor, I'll just swap one into it.