Stock Exhaust...

[punmax]

Hey guys, I noticed that the stock exhaust is pretty nice sounding. It's not to loud or too quiet. I was going to purchase a exhaust system, but I have been thinking of just getting a chrome tip coming out the side. What you guys think?

[FREAKENHYE]

Hey guys, I noticed that the stock exhaust is pretty nice sounding. It's not to loud or too quiet. I was going to purchase a exhaust system, but I have been thinking of just getting a chrome tip coming out the side. What you guys think?

 

 

The stock exhaust is really restrictive. You can gain alot of hp with a aftermarket exhaust, you can actually get mufflers that are almost as quite as the stock ones, with less restrictions. PM me if you are intrested in what im getting, maybe we can copy the one i get and make you a set ship it out to you.

[Woodcutter]

I've thought a little about getting a magnaflow muffler installed, but I think I'll stay stock. I've read alot about the "drone" that you get with aftermarket exhausts not specifically designed for AFM engines.

[FREAKENHYE]

I've thought a little about getting a magnaflow muffler installed, but I think I'll stay stock. I've read alot about the "drone" that you get with aftermarket exhausts not specifically designed for AFM engines.

 

 

You are gonna have the drone with the muffler anyways. So im working on pairing it with the right muffler.

[williamiv79]

Go look at Aero Stealth Mufflers, thats what I have and its very close to stock sound. The one I chose is supposed to be the quietest performance muffler on the avalible, I would agree with that. There is alittle bit of a drone at highway speeds, not enough to discourage anyone.

[VMax2007]

The stock exhaust is really restrictive. You can gain alot of hp with a aftermarket exhaust, you can actually get mufflers that are almost as quite as the stock ones, with less restrictions. PM me if you are intrested in what im getting, maybe we can copy the one i get and make you a set ship it out to you.

 

No offense, but I call

 

The stock systems are not too restrictive. Unless you do the entire exhaust, including headers AND tune accordingly, you will not see any significant improvement in power. In fact, you will likely LOSE low end power, which is really where you want it in a truck, right?

 

Leave it stock.

[fbachman]

Just my $0.05:

 

If you're on a budget, or prioritizing with a limited budget, the muffler is the last thing I would touch in a GM NBS Pick-Up. Please allow me to qualify before flaming me! I'm NOT saying not to hit the exhaust... just that you're NOT going to get the benefit you would see out of other mods first --- assuming performance is your TRUE goal, rather than sound; neither of which is wrong or bad--- you just have to decide if you want noise over power, or power over noise.

 

(Best analogy I can come up with are V-Twin motorcycles. You can put pipes on a V-Twin, but that doesn't add up to performance necessarily. Need to Jet, get the timing just right, allow more air in to take advantage of the increased flow potential for the change in back pressure, etc..)

 

Why not do the exhaust first?

 

The most restrictive point of the stock exhast system is, typically, the CAT. I would go with a low-restriction CAT prior to changing a NBS muffler. In my experience between Ford modular V8 powertrains and the GM NBS powertrains---I would say that MY EXPERIENCE says that the GM exhaust is pretty nice and has reasonably low restriction --- now, out of the box, it may not SOUND like a rolling avalanche, but now we're getting into the sound versus performance gain.

 

If this were a Ford forum, my advice may be a little different, as my personal experience tells me that the restriction of the Ford mufflers actually exceeds the restriction of their CATs (by a significant margin).

 

So, for power, I would do this, in order (again, not saying it's right or wrong, just my $0.05)

 

1. Cold Air Intake (GM Perf, Volante, whatever floats your boat)

 

2. Power tune (Diablo, or whatever floats your boat)

 

3. Exhaust, preferably both low-restriction Cat + CAT back system

 

4. If you really want to go radical at this point --- headers.

 

Now, with the power programmer, you can continuously tweak with each mod to get the most with whatever combo you have above (all or some).

 

Again, just my $0.05

[VMax2007]

Well said Frank

[Tylerz71]

Just my $0.05:

 

If you're on a budget, or prioritizing with a limited budget, the muffler is the last thing I would touch in a GM NBS Pick-Up. Please allow me to qualify before flaming me! I'm NOT saying not to hit the exhaust... just that you're NOT going to get the benefit you would see out of other mods first --- assuming performance is your TRUE goal, rather than sound; neither of which is wrong or bad--- you just have to decide if you want noise over power, or power over noise.

 

(Best analogy I can come up with are V-Twin motorcycles. You can put pipes on a V-Twin, but that doesn't add up to performance necessarily. Need to Jet, get the timing just right, allow more air in to take advantage of the increased flow potential for the change in back pressure, etc..)

 

Why not do the exhaust first?

 

The most restrictive point of the stock exhast system is, typically, the CAT. I would go with a low-restriction CAT prior to changing a NBS muffler. In my experience between Ford modular V8 powertrains and the GM NBS powertrains---I would say that MY EXPERIENCE says that the GM exhaust is pretty nice and has reasonably low restriction --- now, out of the box, it may not SOUND like a rolling avalanche, but now we're getting into the sound versus performance gain.

 

If this were a Ford forum, my advice may be a little different, as my personal experience tells me that the restriction of the Ford mufflers actually exceeds the restriction of their CATs (by a significant margin).

 

So, for power, I would do this, in order (again, not saying it's right or wrong, just my $0.05)

 

1. Cold Air Intake (GM Perf, Volante, whatever floats your boat)

 

2. Power tune (Diablo, or whatever floats your boat)

 

3. Exhaust, preferably both low-restriction Cat + CAT back system

 

4. If you really want to go radical at this point --- headers.

 

Now, with the power programmer, you can continuously tweak with each mod to get the most with whatever combo you have above (all or some).

 

Again, just my $0.05

 

 

So, do you think a CAI will be more of an improvement than a muffler?

 

I thought that they work in conjnction with each other.

[FREAKENHYE]

The stock exhaust is really restrictive. You can gain alot of hp with a aftermarket exhaust, you can actually get mufflers that are almost as quite as the stock ones, with less restrictions. PM me if you are intrested in what im getting, maybe we can copy the one i get and make you a set ship it out to you.

 

No offense, but I call

 

The stock systems are not too restrictive. Unless you do the entire exhaust, including headers AND tune accordingly, you will not see any significant improvement in power. In fact, you will likely LOSE low end power, which is really where you want it in a truck, right?

 

Leave it stock.

 

 

Thats fine you have your opinions, By next week i will have a dyno sheet to prove the before and after of the exhaust. People are gaining HP with a cat back exhaust.

[GENESPOOLS]

bring on the dyno sheets and end this once and for all

[Silverado4x4]

As said above the stock exhaust is not to restrictive and you will hurt the low end torque by going to a aftermarket exhaust. Alot of people think they got more HP cause of the sound as goes for the aftermarket intake system also, sounds like you have more HP but you dont. By the way your not going to feel 10-15 more HP in a motor and if the aftermarket exhaust does give you any it will most likely be around 3-5 HP if that.

[GENESPOOLS]

all i know is i installed a gibson cat back on my 2500 cc 6.0 and i could not here inside the cab when pulling the 5'r down the road. lasted about a month before reinstalling the stock exhaust. could not say i felt much of a performance gain but i have my sanity back.

[fbachman]

Engines/Powertrains are SYSTEMS --- components, devices and boundary conditions that WORK TOGETHER as a unit to fulfill the task of getting power to the road via the tires.

 

IMHO, a cold air intake, strictly compared with the installation of an aftermarket "behind the cat" exhaust upgrade, will provide more benefit.

 

Again, talking about ONE thing over another is silly, as the powertrain is a system. These components are NOT single-point effects. Combinations of upgrades improving one aspect of the system, front-to-back, has the most chance of proviiding significant improvement.

 

Here's an experiment: take the exhaust completely OFF behind the Cat, so the Cat is the muffler. I think what you will find is that it won't be a WHOLE lot more noisy and it will perform about the same until you increase the available mass flow rate of air TO the engine (intake).

[FREAKENHYE]

Totally understandable. But only a dyno sheet can prove if any gain what so ever. My dyno guy has seen as much as 20hp to the rear wheels on the GM trucks just from catback setup. I dont take anyones word over anything that is why i dynoed my car stock so that i will know what hp i will have after the exhaust.

 

 

People have to understand CAI once you install that you have to tune your vehicle to get the full gains.

 

Need to tune it after Header install also.

 

and just about every engine upgrade possible.

 

 

My full upgrades is just stock bottom end with ported top end, cam, headers, exhaust, CAI ( possibly ram air )