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Old 11-04-2009, 08:25 PM   #1
lavid2002
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Default High flow cat VS No cats...none...

Hi guys...I am putting in an up pipe, and a CBE....and a downpipe too. I was looking to buy a high flow catted down...but Ive been thinking. If im going to be illegal...and practically fail emissions already in NJ and im going to HAVE to resort to a local ****ty garage for me to pass emissions...should I just go for broke and get a catless down? Will this be insanely loud? I dont want a super loud car I just want something with some balls to it because my WRX right now barely hums...


Opinions??
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-Dave

P.S. CBE is SR*S...
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Old 11-04-2009, 08:29 PM   #2
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catback exhaust determines how loud the car is, not catted/catless downpipe. Downpipe plays minimal role in how loud the exhaust is. If you want a quieter exhaust make sure there is a resonator on the rear exhaust pipe. And generally Ebay catbacks are pretty loud.
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Old 11-04-2009, 08:35 PM   #3
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Check out Unabombers exhaust faq in this section. He has sound levels for particular exhausts, but no resonator will make it loud. My Apex'i N-1 has a resonator and is perfect...for me at least
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Old 11-04-2009, 08:46 PM   #4
lavid2002
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hmmm...So whats the deal with the downpipe? Should I just go for broke and have no cats? Or should I get a catted down and cross my fingers for inspection?
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Old 11-04-2009, 08:50 PM   #5
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go catless. I had a highflow cat for most my cars life. Recently swapped to catless and regret not doing it sooner. a bit more power, better throttle response and its not any noisier and barely smells.
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Old 11-04-2009, 08:51 PM   #6
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Quote:
Originally Posted by lavid2002 View Post
hmmm...So whats the deal with the downpipe? Should I just go for broke and have no cats? Or should I get a catted down and cross my fingers for inspection?
No sniffing in NJ. So long as you have a way to get rid of your CEL, you'll pass being catless.
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Old 11-04-2009, 08:53 PM   #7
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.........
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Old 11-04-2009, 08:55 PM   #8
lavid2002
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Quote:
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No sniffing in NJ. So long as you have a way to get rid of your CEL, you'll pass being catless.
SAHWEET :P
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Old 11-04-2009, 08:56 PM   #9
rexman2002
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Are you getting a tune with the downpipe?
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Old 11-04-2009, 08:59 PM   #10
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Quote:
Originally Posted by lavid2002 View Post
SAHWEET :P
They do look under the car though... so a full shiny system could get you caught. If I were you I'd put the stock catback on for inspection and if they ask say the resonator is a cat... It worked for me at Eatontown DMV.

YMMV though
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Old 11-04-2009, 09:39 PM   #11
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umm, i am quite sure most people who work on cars know the difference between a resonator and a cat

You won't necessarily be illegal with a catted downpipe, after 8 years or 80k miles you are no longer mandated to replace the cats with OEM ones. Because after 8 years or 80k, the federal warranty on emissions is up and the government can't require you to go to the dealership for parts, that would constitute a monopoly. So if you have over 80k miles, you will probably be all set with a catted dp. A catless dp is illegal, no matter what. but it's up to you. hope that helps you out making your decision.
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Old 11-04-2009, 09:48 PM   #12
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Quote:
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umm, i am quite sure most people who work on cars know the difference between a resonator and a cat
Tell me another, you're killing me! The people are every emissions center I've ever been to look like they hate their lives and couldn't care less about your car. They are just waiting to get off work and go get drunk. You think they know/care about a resonator vs a cat?!
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Old 11-04-2009, 10:01 PM   #13
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well I guess it's just because I assumed that inspections were done by technicians like here where I live. Technicians like myself. I suppose you may be correct. When I do an inspection on a car, I know the difference and I wouldn't let it go because it's my ass if they got caught. Something about the possibility of fines and jail time make you do things properly. But hey, if you can convince someone that a resonator is a cat, then by all means have at it.

But I would still assume that the people who are qualified to do inspections in any state would have to have at least a basic knowledge of cars and know the difference. Just saying...
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Old 11-04-2009, 10:14 PM   #14
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Quote:
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But I would still assume that the people who are qualified to do inspections in any state would have to have at least a basic knowledge of cars and know the difference. Just saying...
I wouldnt.
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Old 11-04-2009, 10:15 PM   #15
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Haha, alright, noted. I guess I just don't know how they do it down there in NJ.
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Old 11-04-2009, 10:16 PM   #16
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Quote:
Originally Posted by hypoxvi View Post
But I would still assume that the people who are qualified to do inspections in any state would have to have at least a basic knowledge of cars and know the difference. Just saying...
So how can you tell the difference?

They are generally covered in the same type of heat shielding. I'd love to hear how one would know with certainty.

Let me show you some pics...

Resonators or cats: (we'll start easy)

http://www.clublexus.com/gallery/data/4536/IMG_0973.jpg

This is an easy one, but that's b/c we know subarus

http://usera.imagecave.com/RodPics/IMGP1997.JPG


Which one's which?

http://izover4u.us/mini/2.jpg

How about here?

http://www.cp-e.com/imgs/maz6s_hdr_oem_ex_sm.jpg

Last edited by REX8; 11-04-2009 at 10:23 PM.
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Old 11-04-2009, 10:18 PM   #17
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Because I work on cars professionally. Trust me. I know the difference.

oh first pic resonators on the after market, and cats on the stock.

second yea, obvious.

the third pic stock header there has a pre-cat and a cat while i bet that header probably has a hiflow cat there, but no pre cat.

Last edited by hypoxvi; 11-04-2009 at 10:27 PM.
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Old 11-04-2009, 10:20 PM   #18
kh15
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i have a cobb catted dp and 304 ft. lb and 245hp on a custom stage 2 tune...as far as im concerned there is no difference as long as your tuner knows what he's doing!
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Old 11-04-2009, 10:29 PM   #19
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Quote:
Originally Posted by hypoxvi View Post
Because I work on cars professionally. Trust me. I know the difference.

oh first pic resonators on the after market, and cats on the stock.

second yea, obvious.

the third pic stock header there has a pre-cat and a cat while i bet that header probably has a hiflow cat there, but no pre cat.
Ok, I'll make it tougher for you then.

Hold please:

What are these?






And I never got an answer for the 4th pic.

Last edited by REX8; 11-04-2009 at 10:43 PM.
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Old 11-04-2009, 10:38 PM   #20
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hahaha. sweet, fun games! But really to the OP, there isn't much of a difference between catless and catted power-wise.

well the top one is hard to tell because parts of it are kind of chopped up, but the bottome one looks like one of those ebay test pipes for a honda, but again, hard to tell because it's only part of the picture and choppy.

Last edited by hypoxvi; 11-04-2009 at 10:46 PM.
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Old 11-04-2009, 10:46 PM   #21
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hahaha. sweet, fun games! But really to the OP, there isn't much of a difference between catless and catted power-wise.

well the top one is hard to tell because parts of it are kind of chopped up, but the bottome one looks like one of those ebay test pipes for a honda, but again, hard to tell because it's only part of the picture and choppy.
Top one is a uniform cylinder, just like the second one. The rest of the picture isn't relevant, is what you're looking at a resonator, or a cat?
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Old 11-04-2009, 10:49 PM   #22
hypoxvi
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well anyway, it is far easier to tell when you get a whole picture, not just pieces. but my point was that when it is on a vehicle, it is pretty much unmistakable as to what they are.
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Old 11-04-2009, 10:50 PM   #23
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The easiest way to go for inspection worries is a 2 section down-pipe. Its really easy to put the stock 3rd cat in an out for an inspection. You should pass emissions with just that cat if you make sure your car (and cat) is warmed up prior to the test.
Check with others in your state to see what set-up they passed with.
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Old 11-04-2009, 10:52 PM   #24
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Quote:
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well anyway, it is far easier to tell when you get a whole picture, not just pieces. but my point was that when it is on a vehicle, it is pretty much unmistakable as to what they are.

The Honda "test pipe" is an inline resonator on a $50k BMW. The first one is an inline cat, located in the EXACT SAME PLACE as the inline resonator (on a different model BMW).

It is not unmistakable. Here you have two similar looking cylinders, located in EXACTLY the same place on two different cars, and you think you'd know which one was which? All you'd have to go on is what I showed you. And that wasn't enough for you to do so.

Last edited by REX8; 11-04-2009 at 10:59 PM.
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Old 11-04-2009, 10:57 PM   #25
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Ahhh whatever, I was just messing around.

I'll concede, in most vehicles (I picked an exception), one with some knowledge and common sense can spot a cat from a resonator.

I guess the point is just how much do you really think these people care and/or how sharp do you really think they are?
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