Okay, so I was planing to go with the biggest size 4" Magnaflow the 30" case... and dump it under the truck. People say that is going to be way too loud. And that nothing 4" will have quiet and stealth.

That being said, I was thinking of, instead of 1 30" case Magnaflow, maybe I can fit 2 of them back to back on my Tahoe, then turn down before the axle, and I should be golden?

Im thinking a 24" case Magnaflow 4" muffler then followed by the 30" case 4" Magnaflow, Then dumping it under the truck, or even adding a 12-15" resonator and dumping it after that. It should make for a quiet setup with Longtubes and ORY??? So I figure a Total of 54-60" of casing quiet things down?

I would use little to no pipe with the mufflers back to back then dumped. The truck will be up for a few months, then I can get measurements of what can fit, maybe 2 30" case or maybe a 30" & a 22" work..

Just got that idea as resonators seems to cost almost the price of a 2nd muffler. So if I got space, why not use it.

Truck specs are in sig, and may go Procharger for xmas.

 

Is there enough room for all of that? Definitely the more baffling you have, the quieter it will be and with 4" there will still be plenty of flow.

 

Yah thats gona be hard to get 2 30'' mufflers under your truck. I am running a HUGE edelbrock, it is far from stealthy

New edelbrock diesel muffler.. Sierra GMC - YouTube

 

im going to be running 2 12" borla XR-1s in line when I get my truck back from the tranny shop...im not expecting it to be stealthy, lol

 

I just picked up the magnaflow 12773 muffler. 30" case 36" overall. There's no way to fit 2 of them under your truck. It's huge. especially if your going to dump it before the axle. If you go over the axle it may quite it down alittle bit.

 

Yea, I know the case is 30" and overall 36". I may not be able to fit 2 of the 30 inch mufflers, but maybe 1 30" and 1 20" mufflers in there back to back and dump it after the smaller muffler. I will be under the truck daily so Ill get some measurements of what will work out, and Ill post clips after. I want something deep, but mellow, and must be free flowing. I will also be adding 2 stainless dumbie cats in my ORY as well, so the entire exhaust is being redone.

If the extra 20" case not fit, I will springs to the 14" case 4" muffler to run with my 30" case muffler. The measurements should tell, I will fit the biggest 2 I can.

A Tahoe has a good bit of room underneath the body. I will see how creative, and free flowing, as well as stealth I can do.

 

4" is a lot of exhaust for a NA build... its gonan be interesting to see what you think of it. Are you dead set against 3.5"? I think it will be a lot easier to build something stealthy at that size pipe.

 

The theoretical limit of a single 3.5" is about 500bhp. A cammed 6.2L can eclipse that rather easily. That's where I'd be looking at running dual 3" myself. Good inbetween size.

 

How do you calculate the actual theoretical limit of a particular sized exhaust? I ask because I have a 4.125 stroked ls3 in my truck and it haas the 3.5 Magnaflow Denali cat back currently and I am wandering if I am leaving much on the table with this as in comparison to a single 4 or a dual 3 setup.
What is the theoretical limits of a 4 inch single exhaust?

 

Flaco went well into the 10's with a single 3'' exhaust.