Hey guys Iam at a point in modding that everybody goes through. MIDPIPE or HIGH FLOW?! Yes I know this topic has been beat to death and my search didnt find what I was looking for. What I want to know is the people who have a midpipe, did you make the right choice? Would you want to go to high flow or stay with the mid pipe? What are some of your expeirences with the midpipe and what can I expect from a midpipe? What are the sure fire ways that you did to control boost? By outta control boost and hard to control boost, what were your symptoms?
Thanks for your help and the fresh new opinions!

Jonas

Mods are:
greddy SP
pettit SS DP
profec-b
apexi intake
tein HA coilovers
pettit unlimited ECU
boost and a/f ratio gauge
and still deciding between high flow or midpipe
potenza r930

 

i like the midpipe set up. one reason is for the smog testing here, or should i say, a lack thereof. i had a random tech. hi-flow cat on my first fd, and now, on my second one, i have a midpipe, or actually a straight through exhaust.

i definately know that the midpipe has better flow, and the difference in power is noticable. however, with the new found freedom to the exhaust system, you WILL NEED boost control. BOTTOM LINE. the boost will creep and just tell yourself that you will get a controller, do it soon. I ran with a ton of mods and and no mgt. of any kind, and bit the bill of a new motor. trust me, you will need this.

plus, the midpipe lets you shoot flames, and theyre cool at night.

if you also have the option around the time, and do not already have a fuel pump, do that mod as well. the lack of boost control and proper fuel delivery was the main reason my motor went.

i hope that this helps you in making you decision, and has proven to be somewhat informative....

-louis

 

sorry, i really did not read the sig, and now know that you have a profec-b. you should not have any problems with the spiking problem. just make sure the fuel is there.

 

i had bonez high flow and then a mp...
i love the mp..car keeps pulling to the redline no power drop off in the least bit

with greddy sp it wont be 2 loud..i acutally had that exhaust and went with a nurspec for a bit more flow/rumble and its loud, but what you gonna do


you prob will spike..i had profec b, the boost controller has nothign to do with creep...creep is uncontrollable b/c the stock wg is the size of a penny..when i first put mp i went from rock solid 12psi.(w/high flow).put on the mp with profec off held 8psi till5k then pulled like the tac to 16psi by 7500

after i ported the wg i couldnt creep past 11psi no matter how hard i tried...

but its deff time to port wg, and get the extra fuel

mp all the way, just have to watch for cops more...flames attract popo

 

How much does wastegate porting cost? Is it worth doing on a set of stock twins with lots of miles on them, or should I just get rebuilts and have it ported prior to installation? My turbos have 105k on them, but my motor only has 7k on it...I'm blowing by some oil, but not too bad. I might go MP too, but am curious about the wastegate deal.

 

I'd go with the mid pipe. Depending apon your cb, you may or may not get boost creep. Its also kinda weird that some cars with all the bolt ons will get boost creep, while others (like mine) won't.

I had a Pettit down pipe, pettit mid pipe, and n1 dual, and it held a steady 10lbs. But the funny thing is, with a profec-b, i get over boost. (yes its hooked up right, and the din switchs) With a home depot boost controller, its fine. But even with the $5 boost controller, i can't get any less than 10bls. Very strange.

There is a guy in rotary power northwest who has all the bolt-ons too, and he can't get less than 10lbs either, and he has all the bolt-ons, with no creep. But he's running the power-fc to control boost i guess.

I'm not going to worry about it, until i put some upgraded twins, and freshen up the motor.

CJ

 

Get the Midpipe. I love my midpipe and will never put a high flow cat on. I never regret going with a midpipe. If you can't handle the loud exhaust then go with a high flow cat. Also, make sure to get your fuel system upgraded too. For example, upgrade your fuel pump and bore out your secondary injectors to 1300cc. If money is a problem don't run more than 12.5 psi with your setup. At 13psi you are pushing the injectors to the max, which is not good at all.

Some FD's experience boost creep and some don't. You can get your wastegate done and upgrade your fuel system for an extra protection from a blown engine.

Bottom line is if you can't stand a loud FD then don't get a midpipe. However, I say go with a midpipe, it's one of the best mods I've every done.

 

I have almost the same setup as you,
I'm running a custom 1 piece dp/mp, greddy PE cb, pettit intake, pettit unlim ecu, Blitz smic, and a Profec b.

I get ZERO boost creeps or spikes, even in the cold winter air up in vancouver.

So I don't think you should have a problem running a mp setup

 

oh and I'm running 0.8kg/cm^2 ~ 11.37psi monitored by a greddy 60mm boost guage

 

With my setup, I get boost creep.

 

will I have boost creep issues with a DP & RB cat-back?

also, has anyone mesured the noise difference a high flow cat & mid pipe? I was thinking I would do MP/cat at the same time as I do DP, but I might wait till I do Apexi power FC later this summer....

does this seem like a smart upgrade progression?

 

trigeek37 - definately wait until you can do the PFC BEFORE doing MP or high-flow cat. You'll need the extra fuel and boost control.

Street King - definately MP if you don't have to worry about emissions. I dyno'd three days apart the only difference was high-flow cat v/s midpipe & HKS Twin Power. I picked up over 40hp to the wheels.

K

 

DAMN 40hp TTW!! Iam going midpipe!

 

40 HP to the wheels????? your high flow cat must have been for a 10 HP lawnmower that's amazing.

I too have a midpipe .... I too recommend it.. If you like loud DO IT.

 

I ran a mp with both the racing beat dual and the apex n1 dual and i didnt have any boost creep at all. I was controlling boost with the power fc. I wonder if boost creep occurs when you upgrade the intercooler?

 

It sounds like you both have the newer turbos without pills where the ports to the wastegate and prespool are narrowed to act as pills. You would never be able to go less than ten until you drilled these out. IMHO

 

Can someone post some info on how to port your wastegate?please,thanks

 

I run Pettits resonated midpipe and really like it. The power is the same as a regular midpipe but the design keeps is a little more quiet.

I'm running the Power FC with Home Depot boost controllers and have no spike creep issues.

I wouldnt do a ported waist gate unless you cant keep the boost down for some reason.

Later,
STEPHEN