High Performance Cats - Help & Advice needed.
Thread Starter
Pro
Joined: May 2006
Posts: 538
Likes: 3
From: Kansas City Mo
High Performance Cats - Help & Advice needed.
I'm finishing up the last stages of the build shown below in my signature. I have 3" collectors on my headers, and 2.5" Borla XR-1 race mufflers.
I'm deciding on cats right now....I'm not too worried about the enviornment due to my lone vehicle's performance exhaust, but I am tired of trying to find an inspection place that will pass my car without legal exhaust. I'm looking at the cats --- I'd actually prefer a test pipe, or something that would pass visual inspection to save both money and the minimal amount of power you lose to a cat. But I'm looking at both sides. How does an inspection place do a visual inspection? Would a test pipe even truly pass? How do they know that a cat is a cat?
What cat would you suggest if I do infact buy a true cat? It seems the magnaflows are about the cheapest, but even their "spun" cat 3" in and 3" out costs a 100 bucks a piece and says only supports up to 5.9 liter. My 383 will be a 6.3 liter. Will I need one with AIR?
Here are some links I found...
What do you think/recommend?
http://www.jegs.com/webapp/wcs/store...0002_393235_-1
http://www.jegs.com/webapp/wcs/store...0002_411601_-1
http://cgi.ebay.com/ebaymotors/3-UNI...spagenameZWDVW
I'm deciding on cats right now....I'm not too worried about the enviornment due to my lone vehicle's performance exhaust, but I am tired of trying to find an inspection place that will pass my car without legal exhaust. I'm looking at the cats --- I'd actually prefer a test pipe, or something that would pass visual inspection to save both money and the minimal amount of power you lose to a cat. But I'm looking at both sides. How does an inspection place do a visual inspection? Would a test pipe even truly pass? How do they know that a cat is a cat?
What cat would you suggest if I do infact buy a true cat? It seems the magnaflows are about the cheapest, but even their "spun" cat 3" in and 3" out costs a 100 bucks a piece and says only supports up to 5.9 liter. My 383 will be a 6.3 liter. Will I need one with AIR?
Here are some links I found...
What do you think/recommend?
http://www.jegs.com/webapp/wcs/store...0002_393235_-1
http://www.jegs.com/webapp/wcs/store...0002_411601_-1
http://cgi.ebay.com/ebaymotors/3-UNI...spagenameZWDVW
Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
Out here they use a mirror on a long handle to see the cat, and yes they can spot a test pipe easy. Magnaflow/carsound is a cheap cats that flows real well, they are cheap. www.performancepeddler.com
Thread Starter
Pro
Joined: May 2006
Posts: 538
Likes: 3
From: Kansas City Mo
[QUOTE=Chance;1560022508]Sorry, but hearing you say 'high performance cat' just makes me think of this picture:
Why is a high performance cat a danger to the manifold? Funny picture, but I don't get it.
Why is a high performance cat a danger to the manifold? Funny picture, but I don't get it.
Team Owner
Joined: Nov 2000
Posts: 45,085
Likes: 1
From: I was a young troubadour when I rode in on a song, and I'll be an old troubadour when I'm gone.
St. Jude Donor '08
A cat (either the car part or the animal) is is not a danger to your manifold.
I just have lots and lots of random cat (the animal, not the car part) pictures that I like to post as often as I can.
Team Owner
Joined: Nov 2000
Posts: 45,085
Likes: 1
From: I was a young troubadour when I rode in on a song, and I'll be an old troubadour when I'm gone.
St. Jude Donor '08
For the questions about the starter wires:
Last edited by Chance; Apr 29, 2007 at 11:02 AM.
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Team Owner
Joined: May 2002
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Carsounds are the cheapest. $50 for a 2.5" and $60 for a 3". They're bigger than bullet cats though. If you're running an X-pipe make sure they fit in there before it.
You could have a hard time passing the sniffer with "fake" cats, so you might as well use real ones and bolt in test pipes the rest of the year.
Race Director
Joined: Feb 2003
Posts: 11,672
Likes: 20
From: Lake Wylie SC
Look these guys up: www.pypesexhaust.com I saw their high flow cat at a show and it looks well made even with a shield. It's so small. Comes in 3" to slide onto your collector. Price is resonable. On their site hit "mufflers" and scroll down to cat.
Mechanic cat reminds me of my old Bengal.
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
For your 383 you need two cats and hi-flow ones; go cheap and it will cost you HP.
My guess is that you need cats that flow 450-500cfm each. I believe there are 3" in/out bullet cats that meet that requirement.
I suggest 3" pipes back to the cats and then reducers to 2 1/2" out of the cats if you don't want to run 3" all the way.
My guess is that you need cats that flow 450-500cfm each. I believe there are 3" in/out bullet cats that meet that requirement.
I suggest 3" pipes back to the cats and then reducers to 2 1/2" out of the cats if you don't want to run 3" all the way.
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
I just bought a set of these, they will be installed next Friday , along w/ a true dual system, no headers (at this time)
http://cgi.ebay.com/ebaymotors/ws/eB...1767310&rd=1,1
The thing I like about these is that they look just like the precats that are on the car now, and will be installed in the same place in the system. Just for some info, I priced a set of RT cats, and they were $200.00 each.
BTW, it seems to me that your combo is making so much power that the cats should not make any real difference?
Good luck
http://cgi.ebay.com/ebaymotors/ws/eB...1767310&rd=1,1
The thing I like about these is that they look just like the precats that are on the car now, and will be installed in the same place in the system. Just for some info, I priced a set of RT cats, and they were $200.00 each.
BTW, it seems to me that your combo is making so much power that the cats should not make any real difference?
Good luck
