EXHAUST!(Any Info or questions post here)

[GT-R]

Wow, mandrel isn't Gods gift to man. I know it's good...not like the pressure bent is a piece of shit.

I think the guys here are just trying to be helpful. First let me say, that I am not trying to sell you a system, but rather want you to know the facts about how the flow inside the pipes work. #1. the stock pipe diameter is 2" and because there are several bends with 90 degrees on them, and the fact that those bends are not made with the mandrel process, you end up with a bit smaller diameter. Also, if you notice, where the pipes go into the stock muffler, it narrows down some aswell in that area. #2. Your max flow is figured on the smallest diameter within that pipe. You can have a 4" pipe 50' long, with a 2" diameter somewhere between the beginning and end and 2" of flow is all you get.

So you have to look at what the cross section of the pipe is at the those bend, because that's all the flow you will actually have. If you use a 2.5" pipe and put a 90 degree bend into it, chances are that you end up with +/- 2". Now, 2" is better than the (real) stock, which is around 1. 75" you have now. The other thing that comes into play is, where ever these (non mandrel) 90 degree bends are, they tend to create a bit more turbulence within the pipe. Turbulence effects the flow in a negative way.

The issue here is not how much you spend, but rather what are you really getting for your investment.

Personally speaking, if you're on a tight budget, I would just get rid of the resonator, and install the nicest exhaust tip you can. This will give you a little louder note, plus make the car look way better.

[scuba264]

Thanks Sam. I know everyone is trying to help and thats always expected on here.

Haha, aren't you tired of explaining the mandrel bend theory...I know I've read it in a million threads. You should have a sticky made and just point people there.

I know pressure bent is not the most perfect solution, but like I said on top of it being slightly cheaper, I'm pretty interested in getting in there and helping make a new custom exhaust. I'm always buliding stuff and working on things and exhausts are something I've never played with. It'll be interesting and still give me what I'm looking for.

Another question...I know theres different grades of the stainless used. Isn't there an issue with trying to weld different types together (304, 409? I might have made those number up ). When shopping for tips should I worry about the tip being the same as the piping?

[jerrodmann]

Thanks Sam. I know everyone is trying to help and thats always expected on here.

Haha, aren't you tired of explaining the mandrel bend theory...I know I've read it in a million threads. You should have a sticky made and just point people there.

I know pressure bent is not the most perfect solution, but like I said on top of it being slightly cheaper, I'm pretty interested in getting in there and helping make a new custom exhaust. I'm always buliding stuff and working on things and exhausts are something I've never played with. It'll be interesting and still give me what I'm looking for.

Another question...I know theres different grades of the stainless used. Isn't there an issue with trying to weld different types together (304, 409? I might have made those number up ). When shopping for tips should I worry about the tip being the same as the piping?

Do you plan on keeping your car for a long time and adding more engine modifications?

I do, that is why I am going to purchase the GT-R. Stainless steel system means that this system will out live the life of my car. I plan on keeping this beast until the wheels fall off it, so I expect only the best for it. IIRC Gt-R rates the system to be fully efficient up to 325HP. Meaning my 252HP now, I have a long ways to go and will doubtfully see that number on a NA motor, but it is nice to know I have the pipes to support up to 325.

Just my insight on the whole deal.

[scuba264]

We're kinda getting off the exhaust topic here, but this is probably it for performance mods. Intake and exhaust, then possibly a new ecu tune. I'm not expecting to put nitrous in or turbo or super charge the thing, and it's tranny would probably explode anyways with too much power. I'll be satisfied with this then work on my spoiler, rims(maybe), and AV stuff. I'm very happy with my performance now and the few HP boost I'll get from my intake and future exhaust setup is just fine for me.

Well, I offically own a dual rear valance and 2 stainless Flowmaster 4" tips. The flowmasters are exactly what I wanted and for the extra few bucks over the magnaflow I figure it's worth it. Thats almost an exhaust! Well, it's gettin there.

[jerrodmann]

here is a quote from GT-R found in a previous posting.

Let me take the time to explain how my system is designed to work. We modified our muffler to perform the way that it does. We are taking advantage of low end torque, and when the demand is there, high end horsepower. All engines share the same basic principles. They all require a specific amount of back pressure at light throttle opening, in order to produce good low end torque, and good flow volume velocity, for high end horsepower. Our muffler does both. At light throttle it provides the necessary back pressure for good torque and gas mileage. And once the throttle is opened and larger volume is introduced into the system, both tail pipes will flow as required. The system was designed to regulate itself whether it is installed on a 3.5 V6 or the larger 3.9 engine. Our goal with this system had several objectives. Sound, performance and gas mileage, while not compromising drivability. This system will flow enough air to produce 325 RWHP. We’ve taken into account several issues, and without getting too technical, we have addressed velocity and volume of the gases, while keeping the relationship of both tuned, for overall performance. Although we are not the first to take advantage of this technology, we were able to make it work on this application with very good results.

About the soot. If you were old enough, or were around back when leaded gas was around (like me), you would have seen a tanish / grey color instead. The soot is a by product of unleaded fuel. Be glad your are seeing the soot. This means, that the system is not trapping it within itself.
-SAM-

source:
http://g6performance.com/forum/viewtopi ... 5&start=15

[rollin20s]

borla mufflers UPDATED WITH PICS!!!!!

got just got my Borla XS mufflers from the Ups man!!! going into town to talk to my buddy about getting them things put on ill keep yall posted

getting ready to be put in

getting the Y piece in

getting the first muffler done

finishing up the second one

putting stock GT tips on


removed resinator replaced with straight


finished product


well it sounds awesome!!! nice deep growl around 2500 rpms and roars at WOT. i will try to get a sound clip up.
it vibrates my seat when i hit that right spot LOL

IM HAPPY

[Wicked]

I was planning on getting one of these. Let me know how it sounds and what your set up is! I was planning on cutting out the res and doing a straight pipe there with the borla xs.

[rollin20s]

Lampoon
That exhaust looks damn good, i'm anxious to hear what it sounds like!
What size piping did you use?? And if you don't mind what did the total setup cost?

its 2 1/2" from the cat to the Y and 3" the rest of the way
and the cost was $200 for the mufflers and $100 to my boy

[8.1L 496 BIG BLOCK]

I looked around but didnt find this yet so here goes. Anyone had any experience with the GM cat-back exhaust system yet? It appears to be a new accessory item for 08, so I know its really early to ask such, but I am considering getting it and having it put on my GXP when it arrives. Before I commit to that I just wanted to check if anyone had seen it or heard it yet and what their opinion is of that performance div. part.

[ElecBlueG6GT]

I doubt if any of the current 6er's have the GM cat back system. I think someone posted the price earlier, but I can't find it.
I paid less than $400 for my Magnaflow. GT-r's is not a whole lot more than that, and better quality than what GM will put together.
What I'm saying, is you could prolly do custom for less, and as good, or better quality.

[jerrodmann]

I doubt if any of the current 6er's have the GM cat back system. I think someone posted the price earlier, but I can't find it.
I paid less than $400 for my Magnaflow. GT-r's is not a whole lot more than that, and better quality than what GM will put together.
What I'm saying, is you could prolly do custom for less, and as good, or better quality.

You don't know that. Your assuming. It could be of equal quality to GT-Rs, maybe not - no one knows yet.

Gm is offering 2 exhuast systems. Who knows what the differences are:

GM PART # 17803094
CATEGORY: Engine Exhaust Muffler
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $699.00
OUR PRICE: $577.37

DESCRIPTION: MUFFLER K




GM PART # 19155028
CATEGORY: Engine Exhaust Muffler
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $799.00
OUR PRICE: $659.97


DESCRIPTION: MUFFLER K



maybe one is single outlet?

[disposablehero]

Didn't someone say that they couldn't even hear the GM exhaust on the GXP when they test drove it? That is one of the things they hated. If money is the issue I would just get a custom system but if you are going to get the GM why not just get the GT-R? Well worth the money and looks 10000 times better than what GM put out.

[jerrodmann]

I think the exhuast system that everyone is seeing on the GXP is the stock one, not the aftermarket one.

[PrimeGTP]

I think the exhuast system that everyone is seeing on the GXP is the stock one, not the aftermarket one.

Werd. I doubt the stock GXP exhaust is any different than the stock GTP exhaust.

[ElecBlueG6GT]

I doubt if any of the current 6er's have the GM cat back system. I think someone posted the price earlier, but I can't find it.
I paid less than $400 for my Magnaflow. GT-r's is not a whole lot more than that, and better quality than what GM will put together.
What I'm saying, is you could prolly do custom for less, and as good, or better quality.

You don't know that. Your assuming. It could be of equal quality to GT-Rs, maybe not - no one knows yet.

Gm is offering 2 exhuast systems. Who knows what the differences are:

GM PART # 17803094
CATEGORY: Engine Exhaust Muffler
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $699.00
OUR PRICE: $577.37

DESCRIPTION: MUFFLER K




GM PART # 19155028
CATEGORY: Engine Exhaust Muffler
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $799.00
OUR PRICE: $659.97


DESCRIPTION: MUFFLER K



maybe one is single outlet?

I did it for less. I'm not assuming anything. I've seen the stock systems, both single, and GTP versions. No one makes one equal quality to GT-R's. If I said GM would be equal to GT-R, I would be delusional.