Jason Kugel

Who has or knows where I can get just the 3.5\" tailpipe section from a 12-14 premium or platinum Escalade with rear exhaust. I have Kooks long tube and Y then a Magnaflow 12909 but the pipe after that was reduced to 3 inch by the previous owner. I'm trying to have a free flowing 3.5" exhaust. I don't see the point in having 2k worth of exhaust only to have it choked to 3 inch at the tailpipe. If I want to keep the resonator I need to find this pipe or a shop near me that will bend 3.5..

madmann26

iTrader: (7)

Facebook marketplace will be your best bet. I got mine there. Paid $60 from the flex to the tailpipe.

Bgbldodge

Pretty certain the 3” is factory on the 6.2 after the muffler. Unless those specific models got a full 3.5”. You aren’t sacrificing anything with a 3” pipe right there except for bragging rights.

Jason Kugel

I thought 6.2 escalade were 3.5 all the way to the resonator? Magnaflow 12909 is 3.5 and supposed to be a clean swap?

I bought the truck used with the Kooks setup but It looks like somebody either added a 3 inch aftermarket muffle or it's a Tahoe exhaust because after the y pipe is 3 inch pipe to muffler and 3 inch tailpipe to the resonator but you can see where they cut the OEM muffler off the resonator and welded this on. From what everyone is saying it should be 3.5" tailpipe

Bgbldodge

I’m running a 6.2 exhaust and it’s 3.5” from y-pipe to muffler and then I believe (I just had it replaced) 3.5” from muffler to resonator, and then 3” from resonator back. @00pooterSS is running a stock 6.2 also. Maybe he can confirm it.

00pooterSS

iTrader: (40)

The OE exhaust on 6.2 trucks starts at 3.5" and ends at 3"

I've considered building a 3.5" tail section for my exhuast as well for the same reasons (put a bunch into having 3.5" catback that necks down to 3") but I wrestle with doing it because it isn't super critical. Exhaust gasses cool down as they go along through the exhaust and can flow through smaller pipe as the length goes on... hope that makes sense. I may have fubar'ed the wording but that's what I've read and heard from some people that know more than I do about exhaust flow.

As for just the tail section, you can't just buy that. You could go to a junk yard and cut it off, or try to fiind a used full exhaust and cut it off, but I'm willing to bet a solid dollar it's designed the same way it is on the trucks and necks down to 3 at the resonator section.

I've considered buying a 3.5" resonator and a couple of pieces of 45 degree angle 3.5" pipe off ebay and a section of straight 3.5" and taking it to a muffler shop and having a tail section built... That would be the way to make it full 3.5".. unless for some odd reason the SUV exhaust is in fact different. But I don't know why they would do that on the SUV only.

RB04Av

This is true: the gasses cool down as they go through the system, and that makes the pressure and/or volume drop. Meaning, you can use slightly smaller pipe the farther toward the rear you go, to a point, and it makes no difference.

Furthermore, once you get past the muffler, the flow is smoother (that being The Point of a muffler in the first place) meaning it doesn't have the high-volume peaks that exist BEFORE the muffler, which further reduces the absolute need for the same size pipe all the way back.

I'm thinking, unless this is an ABSOLUTE MAX EFFORT situation in a sanctioned class where the rules require an exhaust in the totally stock length and routing (never heard of such a class but it wouldn't be the first time a class I've never heard of has popped up), there's nothing to be gained there.