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Old 11-04-2003, 05:36 PM   #1
koolaid
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Default would you buy this catback?

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Old 11-04-2003, 05:57 PM   #2
AustinSTi
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3" piping for a NA car is far too large, if your whip is a 97 outback, I would go with a 2.25" exhaust at the most
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Old 11-04-2003, 06:14 PM   #3
koolaid
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whats wrong w/ 3 in?
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Old 11-04-2003, 06:17 PM   #4
Matt Monson
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not enough back pressure. You will actually lose HP with too big an exhaust...
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Old 11-04-2003, 06:26 PM   #5
koolaid
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I could almost swear back pressure was the root of all evil
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Old 11-04-2003, 06:40 PM   #6
Jejunum
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Quote:
Originally posted by Matt Monson
not enough back pressure. You will actually lose HP with too big an exhaust...
its actually not back pressure that is a big issue but instead lack of exhaust velocity.

when building an exhaust system one wants to eliminate as much as back pressure as possible...while keeping exhaust velocity as high as possible

heres a link
http://www.cobbtuning.com/tech/exhaustdesign/index.html
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Old 11-04-2003, 07:23 PM   #7
Matt Monson
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When the heck did Josh post that up??? I am a regular on their site and their forum and hadn't seen that. Thanks...I consider one of the benchmarks of a good day one where I learned something new on these forums...Today it was a good day...
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Old 11-04-2003, 07:41 PM   #8
koolaid
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so i should get this CB???
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Old 11-04-2003, 07:53 PM   #9
Jejunum
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Quote:
Originally posted by koolaid
so i should get this CB???

if its a 3 inch diameter pipe...no

i recommend a stromung catback. i have the stainless steel single pipe (not the XA) and it sounds great!
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Old 11-04-2003, 08:20 PM   #10
koolaid
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I am poor, i need cheap performance
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Old 11-04-2003, 08:30 PM   #11
Jejunum
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Quote:
Originally posted by koolaid
I am poor, i need cheap performance

custom magnaflow is ur best option then; buy the pieces (muffler and catback - if u search i think u can find part numbers) you need then find a reputable exhaust shop to weld and chop everything
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Old 11-04-2003, 09:07 PM   #12
Ahzlon
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it's all part of Borunolies <sp??> principle... High pressure low velocity... high velocity - low pressure.. sorta like a vaccume...
it pulls air up the vac pipe at a high velocity.. creating low pressure.. ie.. low back pressure... sounds odd... but it's totaly true... it's one reason u can talk and air planes fly
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Old 11-04-2003, 11:53 PM   #13
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you all talk like you know what you are saying.

2pt5rs on the board has a 3" exhaust on his RS, and yes it DOES loose some torque, but what it looses in torque, it makes up for in HP.

His RS is just as quick as mine, with similar mods

I have 2.25" exhaust, UDP, intake, flywheel & clutch. On his car he has a 3" exhaust, intake, flywheel & clutch.

They are the same on the road.

-justin
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Old 11-04-2003, 11:56 PM   #14
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yes, I lost some low end torque, but gained a lot of high end....my car climbs to 6275 REAL quick...it used to be 6200, but, I think I hit the rev limiter soo much it bumped it up j/k... I'm currently looking for a 2.5-2.75 scoobysport...I love the sound of it too much

Matt
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Old 11-05-2003, 12:01 AM   #15
Jejunum
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Quote:
Originally posted by Blindeye_03
you all talk like you know what you are saying.

2pt5rs on the board has a 3" exhaust on his RS, and yes it DOES loose some torque, but what it looses in torque, it makes up for in HP.

His RS is just as quick as mine, with similar mods

I have 2.25" exhaust, UDP, intake, flywheel & clutch. On his car he has a 3" exhaust, intake, flywheel & clutch.

They are the same on the road.

-justin
well i guess u know better than cobbtuning? the only knowledge i can draw on is my engineering background...if people say to maintain torque u must maintain exhaust velocity ; well i understand that...
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Old 11-05-2003, 02:17 AM   #16
AustinSTi
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i believe Brucelee ran a 3" exhaust on his na rs a while back and he stated it ran like ish
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Old 11-05-2003, 04:59 AM   #17
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If you need cheap performace, go custom. Find a custom exhaust/muffler shop in your area and get something made. Should cost you a bit less than $300 for a catback. I had a Stromung for 2.5 years and it was great, but now that it's rattling and i'm in college(read "pooR") i can;t afford a new one. I am going with a super trap 2.25" muffler welded to my 2.25" stromung midpipe. should b great.
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Old 11-05-2003, 05:14 AM   #18
jasona
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Quote:
Originally posted by koolaid
I am poor, i need cheap performance
I paid $80 for a muffler and $30 for the piping. Complete headerback, not catback Custom is the way to go
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Old 11-05-2003, 10:51 AM   #19
m750
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3.0 is huge, 2.5 is larger than I'd go. 2.25 is what I've heard recomended from the people who used to be here...
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Old 11-05-2003, 11:56 AM   #20
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I wanted an exhaust that had that same look at the rear can. I bought a pep-boys special 2.5" stainless fart can. I cut off the stock RS muffler, welded on a 2-2.5" adaptor then made a hanger and installed the can. Overall outside the car sounded fine. Inside there was just way too much resination and was just too loud.
I just bought a SPT/brospeed system to replace it. Sounds much better.
Seat of the pants feel was the same with both.
I think that the 3" is going to be way too big. I passed on that e-bay auction because of the size
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Old 11-05-2003, 04:14 PM   #21
LA
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3" is a bit big, just get a 2.25" catback system
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Old 11-05-2003, 06:24 PM   #22
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i rode in a car w/ a 3" catback and its just fine.
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Old 11-05-2003, 08:57 PM   #23
koolaid
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har, i should have made this a poll.. I want good looks too! I mean the gf *dont ask* is like make it a show car
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Old 11-05-2003, 10:10 PM   #24
twizzstyle
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but how many people are really gonna look under your car and say:

"that doesn't look like 3 inches, does it? This car sure ain't show quality"

You don't need a huge exhaust to look nice!
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Old 11-06-2003, 12:38 AM   #25
Derk1127
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Back when my car was NA my first exhaust was a blitz nurspec which had 3" piping only from the axle back and it completely sucked the torque out of the low end of my car. Top end didnt change too much but i thought the difference down low was dramatic. I then switched to a greddy evo with 2.5 inches and the car seemed to pull off the line much harder and it still had all the top end i had with the nurspec. this can be because it is a catback vs. a axle back but i think that 3" is too much for a NA car. Im boosted and im still runing with my 2.5" Greddy evo and I think its fine... although im looking at other exhausts now... like the greddy DD

one more note, if you get your exhaust done custom, make sure your tubing is mandrel bent and make sure they weld the can on so its not angled down. theres too many ricers out there with theyre ford escorts and their J-Bodies with their exhaust tips pointing to the pavement... and it looks cheap that way
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