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Old 08-26-2010, 12:47 PM   #1
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Default Need a high flow cat

i was told that i must put a high flow cat on my car, so i need some advice. I know a little about cats but nothing on how they effect forced induction engines. so let me start my list of questions.
1. Which company makes the best high flow? I have a 3 inch exhaust so it limits the companies i can use.
2. How will adding a cat to a straight flow exhaust effect the performance? is it something that im going to have to fiddle with the tuning after adding?
3. I love my exhaust note and dont want it to change to something high pitched and whiny. Will a high flow effect that?
4. I was told to get a cat because it is federal law, do i also have to have a muffler? I know each state is different but im looking at he big picture seeing as im in the military. I dont want to put one on if i dont have to.
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Old 08-26-2010, 12:49 PM   #2
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http://cgi.ebay.com/ebaymotors/ws/eB...d=270459188697

The one I scored from Enthuza is really nice and it was a waste of money to make a test-pipe in its place due to almost no increase in output.
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Old 08-26-2010, 12:49 PM   #3
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Old 08-26-2010, 01:08 PM   #4
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Originally Posted by Braineack View Post
Yeap...I've even thinking about putting mine back on just to make it quieter and prevent melting the bumper with flames.
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Old 08-26-2010, 01:55 PM   #5
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Quote:
Originally Posted by SneakyB757 View Post
i was told that i must put a high flow cat on my car, so i need some advice. I know a little about cats but nothing on how they effect forced induction engines. so let me start my list of questions.
1. Which company makes the best high flow? I have a 3 inch exhaust so it limits the companies i can use.
2. How will adding a cat to a straight flow exhaust effect the performance? is it something that im going to have to fiddle with the tuning after adding?
3. I love my exhaust note and dont want it to change to something high pitched and whiny. Will a high flow effect that?
4. I was told to get a cat because it is federal law, do i also have to have a muffler? I know each state is different but im looking at he big picture seeing as im in the military. I dont want to put one on if i dont have to.
First of all, there is a HUGE difference in so called "hi flow" cats. ANY ceramic core cat will flow just as much as a regular one, according to Magnaflow. The internal cores are all the same. The high flow designation comes from the larger that stock inlet and outlet. If you need to stay legal, but still need performance gain, use a metallic core CAT. It will flow 5-10 whp more than any ceramic core cat and still keep emissions down. No guarantee that you'd pass testing though.

Adding a CAT is adding a restriction. For a turbo car, not the best way to go, but most people do use a CAT of some kind. It is an install it and leave it alone type of part. At least, until you melt it. You can destroy metallic core CATs, but in general they are more resistant to fuel and spark conditions.

If you add a metallic core cat, it will make the exhaust slightly quieter than without it. I don't use ceramic core CATs, so I cannot tell you what they sound like.
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Old 08-26-2010, 02:00 PM   #6
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buy my 3" Magnaflow
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Old 08-26-2010, 02:13 PM   #7
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Boss Frog makes a test pipe, but it's probably too loud for you. Look into FM's highflow or Jackson Racing's highflow...I forgot which one is resonated but that will keep the sound down a bit...
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Old 08-26-2010, 02:50 PM   #8
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I have "the" metal cat for sale








never been used. still in its original box.
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Old 08-26-2010, 02:52 PM   #9
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ive used the metallic spun one from magnaflow...its nice and works jsut fine.

part number is 59959. planetmagnaflow.com has pretty good prices for them, where i got mine.
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Old 08-26-2010, 03:07 PM   #10
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Is anyone passing emissions with the Bullet or metal cats?
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Old 08-26-2010, 03:12 PM   #11
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To add to hustlers post, anyone passing in CA?
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Old 08-26-2010, 03:38 PM   #12
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Is anyone passing emissions with the Bullet or metal cats?

i did with flying color.


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Old 08-26-2010, 04:59 PM   #13
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You don't need one, I live in CT and I haven't had a cat in my car for over 5 years
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Old 08-26-2010, 05:04 PM   #14
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I sent you over a PM. I have a 3.0" Enthuza cat with 1.8L flanges that I have never used that is just sitting on my shelf.
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Old 08-26-2010, 05:05 PM   #15
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Quote:
Originally Posted by SlideRuler View Post
Look into FM's highflow or Jackson Racing's highflow...I forgot which one is resonated but that will keep the sound down a bit...

none of them, they are just run-of-the-mill ceramiccore cats...
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Old 08-26-2010, 05:17 PM   #16
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Quote:
Originally Posted by Braineack View Post
none of them, they are just run-of-the-mill ceramiccore cats...
meh, then get a test pipe and bolt the OEM cat back on for the one day per year that you need it...
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Old 08-26-2010, 06:10 PM   #17
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You don't need one, I live in CT and I haven't had a cat in my car for over 5 years
thats interesting. the guy that runs the auto hobby shop on base says i need to get one or ill get screwed by the cops. yes my exhaust is loud but i dont think its as bad as some of the other cars on base. its by far the loudest but because the pitch of it is low, so it doesnt seem that loud.
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Old 08-26-2010, 07:22 PM   #18
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Quote:
Originally Posted by SneakyB757 View Post
thats interesting. the guy that runs the auto hobby shop on base says i need to get one or ill get screwed by the cops. yes my exhaust is loud but i dont think its as bad as some of the other cars on base. its by far the loudest but because the pitch of it is low, so it doesnt seem that loud.
Like I said never had a problem, cats are required by law but since I never had a problem I'm not going to put one in.
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Old 08-27-2010, 05:02 PM   #19
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They can hit you up with an inspection ticket if they feel it is merited (ie exhaust too loud, too low). I have a 3" magnablow highblow and I had no problem passing emissions nor do I get **** from cops (but I generally roll past them in neutral so as to not anger the hive). Got that **** on ebay for cheep.
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Old 08-27-2010, 07:32 PM   #20
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I killed a ceramic core cat on a fairly lean tune between emissions tests on a previous car. I wouldn't buy another for a turbo car, "high flow" or not.

Quote:
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What is with the NOppm allowances in VA? That's where I had trouble as my limit is 576ppm at 40kph (not tested for at idle) and I passed with 564ppm.
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