i know they both have the same purpose but high flow cats are pretty expensive. im asking if there is a noticeable benefit from a cat as to just welding your own pipe for a lot cheaper. my only concern would be the o2 sensor.

 

A noticable difference? Of course! Lets see...you will be polluting the environment even worse, you won't pass inpection, you will have to fool your ECU into thinking you have a real cat (or have a CEL on all the time ), and your car will sound crappy.

If it's too expensive for you to get a high flow cat, then just don't get anything.

 

I've used a resonated and straight test pipe and finally decided to go with a high flow cat. Tests prove that on a NA car that the HP differences are minimal... IMO the smell and raspy sound aren't worth the maybe 1 HP difference.

 

Yeah High flow def. I got me a resonated test pipe right now(its illegal) someone is selling me a high flow in a week. The car smells like bad exhaust right now.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hawkze_2.3 &raquo;</TD></TR><TR><TD CLASS="quote">A noticable difference? Of course! Lets see...you will be polluting the environment even worse, you won't pass inpection, you will have to fool your ECU into thinking you have a real cat (or have a CEL on all the time ), and your car will sound crappy.

If it's too expensive for you to get a high flow cat, then just don't get anything.</TD></TR></TABLE>

 

Get a high flow cat or just leave current setup until you can afford one.

 

Here is a comparison between a 200 cell cat and a test pipe, both in 2.25" dia. The dyno is from a K24, but you get the idea there's not much of difference in gain for NA application. The blue is the test pipe.

 

High-flow cat expensive? I don't think so.

http://www.kteller.biz/prodtyp...y=cat

For around 88 bucks+ shipping you can have one. They can even make custom ones.

 

Test pipe .

 

Does a test-pipe have one socket for 02 sensor? Y does my check engine light comes on ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JT &raquo;</TD></TR><TR><TD CLASS="quote">Here is a comparison between a 200 cell cat and a test pipe, both in 2.25" dia.</TD></TR></TABLE>

for good information.

 

I know you probably dotn need any more opinion but, high flow cat

 

obd1 o2s are before the cat, test pipes dont throw cels for us forth genners

 

street car = high flow cat
race car = open header (no test pipe, no exhaust)

stop polluting the air in your STOCK motor.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JT &raquo;</TD></TR><TR><TD CLASS="quote">Here is a comparison between a 200 cell cat and a test pipe, both in 2.25" dia. The dyno is from a K24, but you get the idea there's not much of difference in gain for NA application. The blue is the test pipe.

</TD></TR></TABLE>

good post. The test pipe would gain a little more power if the mixture was richened up a little bit. Nevertheless, good post.

 

test pipes make your car sound like ***....
on a WS2

test pipe:


stock cat:
http://videos.streetfire.net/v...3.htm

my car both times....and polluting is bad!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01electrolude &raquo;</TD></TR><TR><TD CLASS="quote">Does a test-pipe have one socket for 02 sensor? Y does my check engine light comes on ? </TD></TR></TABLE>

As I can see you are the bumper of old threads here. To awnser your question, my test pipe does have a spot for an 02 sensor.

IDK why your CEL light comes on, you are going to have to be more specfic as to what code you are throwing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dumkopf &raquo;</TD></TR><TR><TD CLASS="quote">High-flow cat expensive? I don't think so.

http://www.kteller.biz/prodtyp...y=cat

For around 88 bucks+ shipping you can have one. They can even make custom ones. </TD></TR></TABLE>

The above are some smaller Carsound cats with 400 cell ceramic substrates. They flow more than stock mainly because they have larger outlets than stock. But a 300 or 200 cell cat will flow even more. My 2-1/2" 300 cell metal substrate cats flow around 365 cfm @ 28 inches where my 200 cell metal substrate cats flow around 440 cfm.

 

95green: was ur TP resonated? if not, that could be why it sounded so bad. i just went from unresonated tp to resonated by megan and it sounds a lot better than before.