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Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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Old 12-08-2012, 01:46 AM   #26
Uncle Scotty
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Quote:
Originally Posted by nappingcub View Post
Maybe you should go back and re-read my post before you start flinging insults again.... We both stated that the STI catback won't have much of an effect on power (gain/loss) for stock or near stock sized turbos.



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Old 12-08-2012, 11:46 AM   #27
hoffmanEstates
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I can hear my self think when i am running my prodrive. So i.got tired.of it and having a qiet car so i purchased a jeep 2nd car now i have a dedicated toddler hauler
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Old 12-10-2012, 10:23 PM   #28
jaboyd
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I had Cobb TBE and it was a nice balance in volume and had a sweet con- sistant sound...no droning. Headers will slightly increase the sound level.
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Old 12-10-2012, 11:02 PM   #29
gtasti
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Fujitsubo is very quiet exhaust
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Old 12-11-2012, 08:42 AM   #30
T U R B U L N T
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i used to run a greddy evo 2... i love that exhuast. its nice and mellow but when ur on it, it gets a little loud but nothing crazy.... dude just get another car.. i just had a baby girl and i was gettin nervous that i might have to change my set up and get rid of the car.... just get another car... it saved me tons... it just depends on what you can afford at this point.. me im a loon and i grabbed a denali. it was kind of a bad choice but hey i rather have the baby in a big ass truck then in a lil honda beater or something.. and plus now i can hual and tow. so at fiirst i was a fail.. but now im winning... but im still failing at gas lol its a hard one... as u can see im up and down about the whole thing lol just get a second car... having kids really is about making there lives better but at the same time possibly destroying your own life lol lol good luck dude.
plus the first couple months you have to kind of stay indoors cause of the baby not having shots and stuff.. so u might be able to pull off not changing anything for some time..
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Old 12-11-2012, 03:54 PM   #31
thehollowrift
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lots of good info here.

going to go maddad wisper single outlet.

The entire car was dynamatted (helped alot) years ago.

I also have a 2012 Legacy for normal days, but ya know --- love the STi.
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Old 12-11-2012, 04:18 PM   #32
bluestone
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Quote:
Originally Posted by gtasti View Post
Fujitsubo is very quiet exhaust
ditto. i have a fujitsubo legalis R and even on the throttle it makes barely a burble. can't imagine anything could be quieter except for stock. i don't see them for sale anymore though. previously had prodrive and it droned.
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Old 12-11-2012, 04:31 PM   #33
bluestone
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Quote:
Originally Posted by Uncle Scotty View Post
if you guys really knew anything about exhaust flow and the fluid dynamics of the system....you would know that what you now think is true...really isnt...true..about optimum exhaust pipe size...at least for stock location iwg turbos anyway

this whole fantasy about a 'bottleneck' in the exhaust is

actually....REDUCING the diameter of the midpipe between the end of the dp and the beginning of the axleback from 3' to 2.5"(all of the tbe really all needs to be either coated or wrapped all the way back to the muffler can to work properly.....but kiddie boiz dont know anything about thermodynamics or any of all this kinna un k00 stuff cuz it aint k00) creates INCREASED flow as the exhaust gas cools and contracts and slows down in the pipe....but this only really works if you use a straight through design muffler....but decreasing the pipe size actually CAN increase flow....a LOT...if it is done right...like coated and wrapped
but it aint a 3" pipe so it aint k00 and its wrong because it cant be right because math and all that junk

but what do i know about anything, anyway

wives tales and 'common sense' that is just faulty logic is the rule here......but actually knowing stuff aint k00

oh well....keep on keepin on.........
au contraire. i went from
3" downpipe - 2 1/4" JDM STi midpipe - 2.5" Prodrive
to
3" downpipe - 3" Fujitsubo

on stock turbo. i didn't spring for a dyno run, but accessport virtual dyno gave consistent readouts of over +10 hp and +25 lb/ft and butt dyno agrees
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