Downpipe Midpipe Question
#1
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Downpipe Midpipe Question
I was wondering what mid/down pipe is the best on the market. I want to keep 3" all the way back!!
The only companies I have seen that have 3" is Petitt and M2. I just wanted to see what people have bought and their experiences with different products.
I am currently debating the ecu problem: AEM or ApexiPFC? What do you think
Thanks in advance
Current Mods:
Basic Reliability Mods
Apexi GT Spec Exhaust
Test Pipe form testpipe.com
Apexi Intake
The only companies I have seen that have 3" is Petitt and M2. I just wanted to see what people have bought and their experiences with different products.
I am currently debating the ecu problem: AEM or ApexiPFC? What do you think
Thanks in advance
Current Mods:
Basic Reliability Mods
Apexi GT Spec Exhaust
Test Pipe form testpipe.com
Apexi Intake
#2
Chimera Driver
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3" is 3". The only real differences between the M2's, Pettit's, RB's, HKS's, etc. is going to be finish (stainless or mild steel) and install (some say M2's is easier since it doesn't require removal of the studs). Aside from that, a pipe is a pipe.
#4
Ghost Ride the Whip
the difference is the fitment
the difference is the degree of difficulty of installation. Some downpipes, fit better than others, while some are a bitch to fit. I hear that the HKS ones fit the best out of all of them and the M2 ones fit pretty well too. As far as midpipes go you can get anyone you want if you don't care about noise. If noise is an issue get a resonated one, if that's still not quiet enough weld a borla XR1 muffler into one to tone it down even more.
#5
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I have m2 and it fit great and performance wise it is great. I would suggest that one and probably getting it jet coated would help with heat transfer Midpipe I think I am going to get a custom made one.
#6
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Does anyone have any performance info for the 3" HKS Downpipe?
I just recently bought the Titanium HKS exhaust (4") and wondered if there is a 4" downpipe avaliable???
I just recently bought the Titanium HKS exhaust (4") and wondered if there is a 4" downpipe avaliable???
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#8
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4" would be a little large for the stock Twins. You sig show a test pipe? On my Eclipse a test pipe was a midpipe. It replaced that main cat with a 3" pipe. I had a Pettit DP on my FD but I just bought a FEED DP so I will be selling my Pettit here sometime soon. As far as MP's go. I went with RX7 Fashion SS 3" but I don't think it really matters aside from being resonated or not. I have the PFC which I heard was the most capable easy to tune ECU on the market. Haltech is supposed to be a PITA to install and the AEM is just to new for any real opinions. The PFC w/ Datalogit is the way to go w/ a proven track record and now the laptop capablility is available. That was my choice.
#9
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Re: Downpipe Midpipe Question
Originally posted by JMoney
I was wondering what mid/down pipe is the best on the market. I want to keep 3" all the way back!!
The only companies I have seen that have 3" is Petitt and M2. I just wanted to see what people have bought and their experiences with different products.
I am currently debating the ecu problem: AEM or ApexiPFC? What do you think
I was wondering what mid/down pipe is the best on the market. I want to keep 3" all the way back!!
The only companies I have seen that have 3" is Petitt and M2. I just wanted to see what people have bought and their experiences with different products.
I am currently debating the ecu problem: AEM or ApexiPFC? What do you think
ECU: PowerFC right now, AEM has no base of users yet, Haltech requires installation of all new sensors and new wiring harness
Also, have you fully researched the pros and cons of installing a midpipe? You might have too much boost creep and get large spikes, even with PFC controlling things.
#11
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New Question???
I finally recieved my Titanium HKS 4" exhaust This exhaust is from the downpipe back (NO cat )
I wanted to know if there is a 4" downpipe avaliable somewhere. If custom, anyone know of anyone that can make it??
I plan on running a PFC in the future along with the exhaust, intake. Any forseen problems ahead from anyone. Any other performance parts needed to avoid problems???
From what I searched on the forum this exhaust is one loud *** ************. How much louder is this exhaust compaired to my old Apexi GT Spec??
Does the 3" HKS downpipe outlet bolt up to the 4" Titanium exhaust inlet ??
Thanks for all the input
Jason
I finally recieved my Titanium HKS 4" exhaust This exhaust is from the downpipe back (NO cat )
I wanted to know if there is a 4" downpipe avaliable somewhere. If custom, anyone know of anyone that can make it??
I plan on running a PFC in the future along with the exhaust, intake. Any forseen problems ahead from anyone. Any other performance parts needed to avoid problems???
From what I searched on the forum this exhaust is one loud *** ************. How much louder is this exhaust compaired to my old Apexi GT Spec??
Does the 3" HKS downpipe outlet bolt up to the 4" Titanium exhaust inlet ??
Thanks for all the input
Jason
#12
Originally posted by JMoney
New Question???
I finally recieved my Titanium HKS 4" exhaust This exhaust is from the downpipe back (NO cat )
I wanted to know if there is a 4" downpipe avaliable somewhere. If custom, anyone know of anyone that can make it??
New Question???
I finally recieved my Titanium HKS 4" exhaust This exhaust is from the downpipe back (NO cat )
I wanted to know if there is a 4" downpipe avaliable somewhere. If custom, anyone know of anyone that can make it??
I plan on running a PFC in the future along with the exhaust, intake. Any forseen problems ahead from anyone. Any other performance parts needed to avoid problems???
From what I searched on the forum this exhaust is one loud *** ************. How much louder is this exhaust compaired to my old Apexi GT Spec??
Does the 3" HKS downpipe outlet bolt up to the 4" Titanium exhaust inlet ??
Thanks for all the input
Jason
#14
Originally posted by billvp
there is no sense in having the 4" exhaust if he has a 3" downpipe
there is no sense in having the 4" exhaust if he has a 3" downpipe
-Max
#16
Rotary Enthusiast
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Originally posted by maxcooper
it will still flow better than an all 3" setup even if only part of it is 4".
-Max
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and why do you think that is true??
Pousielle's Law says that maxcooper is correct.
thesaint
Originally posted by maxcooper
it will still flow better than an all 3" setup even if only part of it is 4".
-Max
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and why do you think that is true??
Pousielle's Law says that maxcooper is correct.
thesaint
#17
Yeah, uh, Pousielle told me it would be better. Thanks, thesaint!
Also, there are some bends in the back that will flow better if they are made with 4" pipe rather than 3" pipe.
-Max
Also, there are some bends in the back that will flow better if they are made with 4" pipe rather than 3" pipe.
-Max
#18
Ex fd *****
Originally posted by JMoney
Does anyone have any performance info for the 3" HKS Downpipe?
Does anyone have any performance info for the 3" HKS Downpipe?
the HKS DP is NOT 3" it is only 72mm (same as stock) and uses the SAME RESTRICTIVE CASTING to mount to the turbos as the stock precat.
#20
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Originally posted by the_saint
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Originally posted by maxcooper
it will still flow better than an all 3" setup even if only part of it is 4".
-Max
--------------------------------------------------------------------------------
and why do you think that is true??
Pousielle's Law says that maxcooper is correct.
thesaint
--------------------------------------------------------------------------------
Originally posted by maxcooper
it will still flow better than an all 3" setup even if only part of it is 4".
-Max
--------------------------------------------------------------------------------
and why do you think that is true??
Pousielle's Law says that maxcooper is correct.
thesaint
For laminar, non-pulsatile fluid flow through a uniform straight pipe, the flow rate (volume per unit time) is given by Poiseuille's Equation:
F = DP p r 4 / 8 h l.
in case you don't know what a uniform straight pipe is, that means 4" all the way through -- and you spelled Poiseuille wrong
Also, there are some bends in the back that will flow better if they are made with 4" pipe rather than 3" pipe.
#21
Originally posted by billvp
sure it flows better with a 4" pipe than a 3" pipe, BUT ONLY IF it is 4" all the way through. look up "mandrel bent" and you will see that the bends do not inhibit flow enough to matter at all
sure it flows better with a 4" pipe than a 3" pipe, BUT ONLY IF it is 4" all the way through. look up "mandrel bent" and you will see that the bends do not inhibit flow enough to matter at all
Of course, I am not 100% sure, and it is nice to debunk or discover something that no one else saw before, but I have serious doubts that an all 3" system would flow better (under the conditions seen on the car) than one that starts with a 3" downpipe and goes to 4" after that. That's all I am saying, and I have been giving reasons. What makes you think an all-3" system would flow better?
-Max
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