Ok, ultimate question lol. I need to know what I should do.
First off, i'll let you know that my state has no Emissions standard, so either/or cat or test is fine.
What are the sound differences between the two, and whats the really... main difference? does the test pipe do the same thing a Cat will do, or is it just a piece of pipe in place of the Cat?
Input is appreciated! Thanks!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueLude84 &raquo;</TD></TR><TR><TD CLASS="quote">Ok, ultimate question lol. I need to know what I should do.
First off, i'll let you know that my state has no Emissions standard, so either/or cat or test is fine.
What are the sound differences between the two, and whats the really... main difference? does the test pipe do the same thing a Cat will do, or is it just a piece of pipe in place of the Cat?
Input is appreciated! Thanks!!!!</TD></TR></TABLE>
Get a cat. Not gonna make much of a diffrence to preformance on your car...but at least your doing something for the enviroment

Sound is gonna depend on the rest of the exhaust you have. How big the piping is, muffler, any resinator etc.. the test pipe would make it a lil louder but not by much.

 

honestly there is really no difference from cat to test pipe to straight pipe as far as hp is concerned. as far as sound im sure it will be alittle louder and more "ricy" with a test pipe or staight pipe. even though there are no emission most people in here (including myself) will say use a cat simply for the enviroment

 

save the humans.

 

Get a high flow cat.

 

What high flow cat are you guys useing or which one is the best, worth buying?

I have a 5 gen and 2.5 pipeing.

 

i went from a resonated test pipe to a 2.5" high flow cat. do the high flow cat. test pipes just make your exhaust louder and more raspy. not worth the 1-2hp you might gain over a HF cat. plus you're not polluted.

 

^what type of 2.5" highflow cat are u using?

 

are you guys serious? a high flow cat is a joke, go w/ a test pipe.

your muffler will mainly determine the sound of your exhaust.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">are you guys serious? a high flow cat is a joke, go w/ a test pipe.

your muffler will mainly determine the sound of your exhaust.</TD></TR></TABLE>

um pretty sure that a test pipe is 10x louder and obnoxious than a high flow cat. But i could be talking out my ***..........

i've yet to see a comparison in power differences, but i highly doubt there is much difference with a full exhaust.

 

I have a no cat. a resonator and a straight through exhaust. It is not that loud but if I had a chamber muffler it would be nice and quiet.

Its only when you take out the cats and the resonators with a straight through muffler will it be very loud and raspy.

resonators will take out a lot of the raspiness.

I would say if you don't care about the environment and want the exhaust quiet. Replace the cat with a resonated pipe.

 

go with the high flow
Dont be a scumbag for 1 extra peak hp. You should take a look at this to compare testpipe VS. Highflow dyno, keeping in mind that the test car is a ITR with I/H/E Cams and tuning to show such a slight margin:

http://www.team-integra.net/se...ID=24

yea... go with the high flow....

 

where he lives there is no emissions inspection, which means there arent enough cars to cause a pollution problem even if none of them had cats...these days cars run efficiently and dont pollute that badly even without a cat. you guys should stop being pussies...there are too many cars out there for you to make a difference.

there isnt much power difference b/w a new cat and a test pipe...cant comment on sound but i run a test pipe/full exhaust and my car is too loud. really the biggest advantage of a test pipe is that its a lot cheaper

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheWalrus &raquo;</TD></TR><TR><TD CLASS="quote">where he lives there is no emissions inspection, which means there arent enough cars to cause a pollution problem even if none of them had cats...these days cars run efficiently and dont pollute that badly even without a cat. you guys should stop being pussies...there are too many cars out there for you to make a difference.
</TD></TR></TABLE>

Ever think that pollution is a GLOBAL problem?

you're like throwing up your hands and saying AIDs is Africa's problem, and not ours.

 

The thing is if your car is tuned and running well. It will put out less emissions than an out of tune car with a cat.

I am not condoning running without a cat and yes it is everybody's problem.

 

as far as power: the reason an aftermarket exhaust system makes hp is because its less restrictive (mandrel bends/larger dia. pipe/straight through muffler). the cat is the most restrictive part in any exhaust system. do you honestly think you wont gain hp by removing it?

as far as sound: losing the cat does not make your exhaust obnociously loud like many people THINK. the muffler you choose will ultimately decide the final sound of your exhaust.

if your gonna keep a cat in place you might as well save your $$ and keep the stock cat because anyone whos ever compared the two will tell you theres no difference. its a wate of $$.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">as far as power: the reason an aftermarket exhaust system makes hp is because its less restrictive (mandrel bends/larger dia. pipe/straight through muffler). the cat is the most restrictive part in any exhaust system. do you honestly think you wont gain hp by removing it?

as far as sound: losing the cat does not make your exhaust obnociously loud like many people THINK. the muffler you choose will ultimately decide the final sound of your exhaust.

if your gonna keep a cat in place you might as well save your $$ and keep the stock cat because anyone whos ever compared the two will tell you theres no difference. its a wate of $$.</TD></TR></TABLE>

the LEAST you could do is read the link i posted before posting back. In case you are lacking in the ability to follow links.

The dyno:


The setup:
Comparing a 2.5 in. testpipe (RED) to a 2.5 in. Carsound cat (BLUE) in the same ITR ( 1.8L B18C5 ) with a CAI, Toda B cams, an SMSP 4-2-1 long hybrid header (2.5 in. OD collector), and SMSP 2.5 in. OD exhaust, Apex Power FC fuel tuning:

The specs for a High flow cat VS. a test pipe VS. stock:

Stock Type R 223.6 cfm
Catco (std. core) 2.25" 338.2 cfm
Test Pipe 2.25" 407.1 cfm

the difference between 68.9 CFM is about 1.5hp, and a 1.8 ftlb sacrafice in torque. Missing Gears, do your research and show me numbers that say otherwise. Also keep in mind that the setup has I/H/E, Cams and Tuning. Your gains from changing your cat on a stock setup would be MINIMAL as there are MANY more restrictions to eliminate.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon &raquo;</TD></TR><TR><TD CLASS="quote">The thing is if your car is tuned and running well. It will put out less emissions than an out of tune car with a cat.

I am not condoning running without a cat and yes it is everybody's problem.</TD></TR></TABLE>

This is not true, a car that is tuned and running well will produce less Hydrocarbons, but the same, if not more, Nitrogen Oxides and Carbon Monoxides. Basically, if you ran a well tuned car and a poorly tuned car in your garage with the door closed, you'll still be dead. The catalytic converter helps your car cut emissions by more than 75% (combined NOx+HC emissions from 12 gram/BHP-hour to 3 gram/BHP-hour or less)

I'm posting such detailed information because there are so many people like "Missing Gears" that post things up like "if your gonna keep a cat in place you might as well save your $$ and keep the stock cat because anyone whos ever compared the two will tell you theres no difference. its a wate of $$." then recommend replacing it with a straight pipe for the "AWESOME GAINS".

I'm not denying that the catalytic converter is a bottleneck, but honestly, its not as big of a bottleneck as some of these guys here would make you think.

GET THE HIGH FLOW CAT

 

says the guy that is gonna run straight pipe soon haha

 

your showing me a dyno of a b series. if im not mistaken this thread is for an h series isnt it?

i dont need to see b series dynographs to know how to make power on an h series, i didnt make 276 WHP 206WTQ on a dynojet w/o a alot of experience and knowledge about the H.

i dont give a **** if you run 2 cats, run whatever the expletive you want. i gained my knowledge from experience, not from looking at someone elses b series dynographs from god knows where in god knows what kind of conditions.

just spend alot of $$ and buy yourself a brand new shiny "high flow" cat btw, if getting rid of the cat in favor of a test pipe doesnt make much power, then how much gain do you expect to see from replacing it w/ a supposed high flow cat??????

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">your showing me a dyno of a b series. if im not mistaken this thread is for an h series isnt it?
i dont need to see b series dynographs to know how to make power on an h series, i didnt make 276 WHP 206WTQ on a dynojet w/o a alot of experience and knowledge about the H.
i dont give a **** if you run 2 cats, run whatever the expletive you want. i gained my knowledge from experience, not from looking at someone elses b series dynographs from god knows where in god knows what kind of conditions.
just spend alot of $$ and buy yourself a brand new shiny "high flow" cat btw, if getting rid of the cat in favor of a test pipe doesnt make much power, then how much gain do you expect to see from replacing it w/ a supposed high flow cat??????</TD></TR></TABLE>


dick do you not read?

We ARE talking about flow properties of a pipe arent we?

Stock Type R 223.6 cfm
Catco (std. core) 2.25" 338.2 cfm
Test Pipe 2.25" 407.1 cfm

You've missed the point entirely, I'm glad you have the biggest epenis in a H series, I truly am btw. Its not about it being a B series or a H series, the difference in performance between a test pipe and a high flow cat is negligible, whereas your car will be polluting 3x as much.

So please, with all of your knowledge and experience, and your 276 WHP *****, do you have a better dynograph that shows where your test pipe shows amazing gains over a high flow catalytic converter?

I'll spend the extra $100 now for a high flow cat instead of a test pipe, to save thousands of dollars my kids will have in medical bills, and billions, or say trillions that our taxes will go towards "new technologies" to reverse the effects of people like you polluting 3x as much as I to gain that 2 peak hp.

 

it doesnt take a ******* scientist to know that a hollow pipe flows MUCH greater than a pipe full of restrictive "honeycomb".

you sound like a tree hugger w/ all this talk of pollution. im guessing by the fact that you are here on h-t that you most likely own a car that you drive everyday. until you start riding a bike around or driving a hybrid you can stop talking about pollution because you are no better than anyone else, only much more of a stupid ******* *******.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Missing Gears &raquo;</TD></TR><TR><TD CLASS="quote">it doesnt take a ******* scientist to know that a hollow pipe flows MUCH greater than a pipe full of restrictive "honeycomb".

you sound like a tree hugger w/ all this talk of pollution. im guessing by the fact that you are here on h-t that you most likely own a car that you drive everyday. until you start riding a bike around or driving a hybrid you can stop talking about pollution because you are no better than anyone else, only much more of a stupid ******* *******.</TD></TR></TABLE>

Hmm... lets see

Me:
-High flow cat comperable test pipe in terms of performance
-I show a dyno
-I show the flow qualities for each pipe
-High flow cat will cost more, but worth it in the long run

You:
-No dyno, blanket statements "high flow cat is a joke"
-TEST PIPE FTW!!!!
-I MAKE 276 WHP!!!!
-YOU'RE A TREE HUGGER!

Who's the stupid ******* ******* here? You've just quantified "hollow pipe flows MUCH greater than a pipe full of restrive "honeycomb"" as 69CFM, or a 16% increase in flow, or basically what a low end bathroom exhaust fan can move.

As far as my personal lifestyle goes, no I DONT drive every day, I take the train, then walk to work. At the very least, I am doing my part.

 

if you are supid enough to believe that a test pipe only flows 16% better than a "high flow cat" then your definately not worth anyones time on this board.

why dont you actually try something for yourself instead of being like everyother know it all believing everything that looks good on paper.

have fun walking to work buddy

i will be nice and comfortable driving my new cummins powered heavy duty turbodiesel 2500. which btw is not required to be emmissions tested

 

here we go again with the h-t soap operas haha. personally id go with the highflow, id sleep better at night haha. i have a carsound highflow n i would definately recomend it. yea the test pipe may flow better but this isnt a race car. u may not have to pass emmissions but id rather be safer for every1 too. im not a tree hugger but the less polution there is the less hotter its gonna be in the summer months haha. im gonna be spendin this summer in the sunny warm deserts of iraq anyways so wtf do i care about pollution when im gonna have bullets flyin past my head. but i would rather have a car thats clean than deplete the ozone for 1-2 hp

 

SMSP 2.5" cat