So I picked up this 2004 Yukon Denali about amonth ago. Here's some pics:
I really like the truck so far, but I been debating on doing an exhaust system on it. I decided to
just go ahead and bite the bullet. As a back story, I helped a buddy who has a Sierra 2500 HD
setup a system with a Magnaflow bullet and it sounded good so I was leaning towards that route.
I have a Dodge already with a flowmaster and did not want both trucks to sound the same. I decided
to go with a bullet muffler and chose a Dynomax for a few reasons. 1. I've used their bullets
before in the past and they served me well. 2. After viewing multiple brands of bullet style mufflers
they all look identical, meaning they probably come off the same assembly line somewhere. 3. Cost
was cheaper for Dynomax over Magnaflow. With no logo'd box and holding both in your hands you would
not be able to tell the difference. For those wanting to go even cheaper, Summit carries their
brand of bullet and the only difference is it is a louvered core (think block cheese grater) where
the above mentioned are perforated core (think kitchen paasta strainer). I feel this is a negligible
difference in sound/performance but still a difference none the less. The reason I mentioned the
Sierra above is the engine is the same, a 6.0, and as it turns out the exhaust were identical once
you crawl under the truck. So, this applies to multiple vehicles on the longer chassis, I assume
Suburban, Yukon XL, and Sierra/Silverado (possibly only the HD models). So, the objective here is
to replace the stock muffler with a bullet......this will be slightly more difficult then a cutout
and replace but we'll get to that.
So the stock system consists of cast manifolds, two cats (one on each side), two disconnects approx.
under the passenger seat area, two pipes going into a muffler, two pipes coming out of the muffler,
then into a Y pipe, and out to a single tailpipe and tip. Here is the stock setup:
Starting from the engine, this is where the two pipes meet and run side by side. This is directly
in front of the disconnect. So for discussion, this is the very beginning on the system as far as
we are concerned.