5" or 6" exhuast
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5" or 6" exhuast
Im looking at the 4" vs 5" MBRP exhuast for my 05 6.0L. It looks like the only option for the 5" is the aluminized, which i don't really think is bad. Compairing equal systems, the 5" aluminum is about the same price as the 4" stainless XP series. I have a SCMT right now and plan on getting a good intake here soon too. What would be the big difference in the 4" vs 5"? Sound? Performance? Any opinions are welcome.
Also, did i read correctly somewhere that on the 05 and 06 the the turbo back isn't really doing much besides what the cat back is doing, if you keep the stock cat in place? I was just looking at the cat back, but would the turbo back be that much better if i plan on keeping the stock cat in place?
-Kevin
Also, did i read correctly somewhere that on the 05 and 06 the the turbo back isn't really doing much besides what the cat back is doing, if you keep the stock cat in place? I was just looking at the cat back, but would the turbo back be that much better if i plan on keeping the stock cat in place?
-Kevin
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We just added the MBRP line last week so all the options are not on the website. Infact the prices that are there are still too high. We need to adjust them yet. There are many options for your truck. Cat back, Turbo back, Cool Duels, Aluminized, 409 and 304 stainless. Give us a call if. You can even get a test pipe that makes it easy to remove and install the at when you like.
In my honest opinion the best way to go is Turbo back. Cat back will give you a better sound for sure. Turbo back will give you better Turbo responce and lower EGT's. It depends on what you want to get out of it as to witch way to go.
MBRP is actually coming out with Stacks real soon....Lots of options.
We also carry Bullydog Exhaust and magnaflow, Dynaflow. There is another one that escapes my mind right now. It is 12:30 lol
Give us a call we can help.
In my honest opinion the best way to go is Turbo back. Cat back will give you a better sound for sure. Turbo back will give you better Turbo responce and lower EGT's. It depends on what you want to get out of it as to witch way to go.
MBRP is actually coming out with Stacks real soon....Lots of options.
We also carry Bullydog Exhaust and magnaflow, Dynaflow. There is another one that escapes my mind right now. It is 12:30 lol
Give us a call we can help.
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Originally Posted by DiscountPowerPrt
In my honest opinion the best way to go is Turbo back. Cat back will give you a better sound for sure. Turbo back will give you better Turbo responce and lower EGT's. It depends on what you want to get out of it as to witch way to go.
FTE *******
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From: Pittsburgh, PA
Oh..Oh...meme!
The intake and exhaust being opened up allows the engine and the turbo to breath and pass more air thru. AS the turbo is now going to breath more, we are going to run MORE AIR IN...cooler air...and we are burn it and get MORE AIR OUT UNDER LESS RESISTANCE....like you running a marathon while breathing thru a straw....or through your mouth without the straw. The EGTS are forced up by a restrictive intake and a restrictive exhaust that impede the free flow of gasses to and from the vital parts. Its really a simple concept, remove the restrictions and increase efficiancy (spelling?) and volume of air.
The intake and exhaust being opened up allows the engine and the turbo to breath and pass more air thru. AS the turbo is now going to breath more, we are going to run MORE AIR IN...cooler air...and we are burn it and get MORE AIR OUT UNDER LESS RESISTANCE....like you running a marathon while breathing thru a straw....or through your mouth without the straw. The EGTS are forced up by a restrictive intake and a restrictive exhaust that impede the free flow of gasses to and from the vital parts. Its really a simple concept, remove the restrictions and increase efficiancy (spelling?) and volume of air.
Mountain Pass
Joined: Feb 2006
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From: Gilbert, AZ
Also from a scientific stand point. the combined gas law
Pressure1 * Volume1 / Temperature1 = P2 * V2 / T2. Thus with the pressure out the turbo the same by increasing the volume for the exhaust to expand into, the tepmerature drops.
Chris
Pressure1 * Volume1 / Temperature1 = P2 * V2 / T2. Thus with the pressure out the turbo the same by increasing the volume for the exhaust to expand into, the tepmerature drops.
Chris
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From: Tennesee
ktplotts,
If you plan to mod the truck to over 500 RWHP, then you will benefit from 5 inch, if not then it's just an appearance item vs a 4 incher. We sell them all and 99% of everybody out there should have 4.0 vs 5.0 as to get 500 RWHP is tough to do and very very expensive to obtain too. If you want the real looks item get the 4.0 inch duals with our 6 inch tips!! That really stops the traffic when they see those! Call us if you have any questions etc.
Mark @ DPPI
If you plan to mod the truck to over 500 RWHP, then you will benefit from 5 inch, if not then it's just an appearance item vs a 4 incher. We sell them all and 99% of everybody out there should have 4.0 vs 5.0 as to get 500 RWHP is tough to do and very very expensive to obtain too. If you want the real looks item get the 4.0 inch duals with our 6 inch tips!! That really stops the traffic when they see those! Call us if you have any questions etc.
Mark @ DPPI
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Thanks Mark, now would i benefit significantly with going turbo back vs cat back, considering i will be keeping the stock cat?
btw...i meant 4"vs 5", not 5" vs 6" like the title says.
btw...i meant 4"vs 5", not 5" vs 6" like the title says.
Last edited by ktplotts; Feb 12, 2006 at 04:27 PM.
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Mark is right. Actually if you oversize the exhaust you will loose the needed back pressure and torque. I ran a 4" alluminized system with an Air Raid intake, and a Superchip on my 04 F-350 and it would light up the tires when it shifted into 2nd. I traded that truck on a new 06 F-350 that seems to have more hp from the factory. It's got approx 500 miles on it now and I'm going to wait to break it in to add the aftermarket products.
FTE *******
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From: Pittsburgh, PA
On a forced induction system, there is no desire for backpressure. It is not needed to obtain a negative pulse like in a naturally aspirated application. On a naturally aspirated system, you want and need to rely on teh negative pulse created in teh collector to travel back to the cylinder during the period of valve overlap to assist in scavanging the cylinder and help draw the intake supply into the port. On a forced induction system, the pressurized intake port is doing a fine job of forcing its contents into the cylinder and forcing the spent fumes out. Even on a naturally aspirated application, you have to test diferant primary sizes, collecter lengths, collector designs...and find out what combination works best for the specific head design. Its one of those things that you never stop researching, testing, and learing about.
Back pressure (To a point...and it takes much testing to perfect) = gasser or naturally aspirated...
Free flowing exhaust = Forced induction
Back pressure (To a point...and it takes much testing to perfect) = gasser or naturally aspirated...
Free flowing exhaust = Forced induction
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From: Easton PA
I know thats almost true but I thought some backpressure was needed for the 6.0s because of the turbo? I thought I read that because the turbo is a variable vane turbo, it needs some backpressure for the vanes to operate properly?
Gary
Gary
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Well, I will be the first to admit that I dont know much about the V-V deal...but I know racing and engines. So if the turbo has some odd requirements, it plainly outside of my history and experiance.
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Puller you are correct, but Gary brought up the pt about the Ford turbo. Ford uses a sensor that had malfunctioned on my 04 twice and had to be replaced. It used back pressure. The turbo defaults to wide open when at idle. I guess the in my way of thinking the point of not going to the 5" exhaust is that is doesn't really give enough difference in performance on a street truck with mild modifications to warrant the cost difference over the 4" pipes.
