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need a catted x-pipe

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Old Sep 4, 2015 | 08:05 PM
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Default need a catted x-pipe

I have kooks 1 7/8" to 3" headders. I need to get a catted x-pipe to pass emissions.

Are there any catted x-pipes out there, or will I have to have the exhaust built?
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Old Sep 4, 2015 | 08:21 PM
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I know SLP makes a catted y-pipe for fitment in the stock location.
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Old Sep 4, 2015 | 09:53 PM
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I'm sure several of our vendors have this, it's for your headers and vehicle:

http://www.coloradospeed.com/headers...1-p-34712.html
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Old Sep 4, 2015 | 10:33 PM
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I have true duals that dump before the axle. I am trying to avoid having to buy a whole new exhaust.
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Old Sep 4, 2015 | 10:52 PM
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Or, what are the best 2.5" in 2.5" out universal cats? Might be able to fit one of those on each side of my x-pipe.
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Old Sep 5, 2015 | 07:49 AM
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http://www.summitracing.com/search/p...6%2B4294951518
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Old Sep 5, 2015 | 08:16 PM
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Originally Posted by onebadapple98
and that is helpful how?
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Old Sep 5, 2015 | 08:16 PM
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I'm looking for experience with a specific catalytic converter, not just a search result for all of the cats that a store sells.
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Old Sep 6, 2015 | 05:39 AM
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I have use magnaflow a few times on different cars and I currently have a 3 inch one on my trans am. I am not sure of the model .I had to replace a bad one that came with my SLP header kit 5 years ago. I think it is this one http://www.summitracing.com/parts/mpe-54959/overview/I think you would want to put the catalytic converters right after the headers then reduce down to your 2.5 x pipe after the converters.

Last edited by onebadapple98; Sep 6, 2015 at 07:06 AM.
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Old Sep 7, 2015 | 12:04 AM
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Originally Posted by onebadapple98
I have use magnaflow a few times on different cars and I currently have a 3 inch one on my trans am. I am not sure of the model .I had to replace a bad one that came with my SLP header kit 5 years ago. I think it is this one http://www.summitracing.com/parts/mpe-54959/overview/I think you would want to put the catalytic converters right after the headers then reduce down to your 2.5 x pipe after the converters.
I am worried that a 3" cat would be too large compared to a 2.5" cat. I am probably going to remove the current exhaust, and see if I have room to insert a cat after the header. I might find an exhaust shop here, and see what it would cost to just have a new exhaust fab'd. I might consider a 2.5" true dual setup all of the way out the back.... the drone inside is pretty loud with the exhaust dumping at the rear axle.
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Old Sep 7, 2015 | 07:39 AM
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if you need a full out the back exhaust, check out the Hooker Blackheart systems.
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Old Sep 7, 2015 | 02:56 PM
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I'm going to talk to a custom exhaust shop here this week. Depending on what they say, the Hooker Blackheart might be my choice.
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Old Dec 9, 2015 | 06:39 PM
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I too am looking for a catted x pipe setup. Wanting to run pipes out the back as a true dual set up... Or lt headers with high flow cats already on them. What did you figure out to do?
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Old Dec 9, 2015 | 07:03 PM
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Originally Posted by TexomaMan_X2
I too am looking for a catted x pipe setup. Wanting to run pipes out the back as a true dual set up... Or lt headers with high flow cats already on them. What did you figure out to do?
I bought 2.5" in/out cats, and had the welded into my current X pipe. I measured the X pipe where a cat would fit, and bought ones that would fit.

I figured that the bends in the exhaust probably shrunk the 2.5" pipe to 2.25", so I wouldn't loose much flow by adding the cats.
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Old Dec 9, 2015 | 07:30 PM
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What size x pipe tubing use? Im looking at using 3in pipe on my ls1. Thanks for the quick response.
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Old Dec 9, 2015 | 08:19 PM
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Originally Posted by TexomaMan_X2
What size x pipe tubing use? Im looking at using 3in pipe on my ls1. Thanks for the quick response.
mine is 2.5"
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Old Dec 14, 2015 | 03:49 PM
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I have 3'' catted true duals with an X pipe, under axle.

My setup is as follows:

Speed Engineering 1 3/4 headers, Magnaflow 3'' universal cats, Summit 3'' universal X-pipe, Moroso Spiral Flow bullet mufflers, Corsa clones run out the back.

It was a fully custom exhaust, and the clearance is okay. Not the best, not the worst.

Zero drone. Perfect volume for a muscle car. Not loud enough to offend anyone but old ladies, not quiet enough to sneak around.

Check out my post history for pics
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Old Dec 14, 2015 | 04:58 PM
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Sounds legit man. I want no drone inside car but loud. not ear cracking rasp loud but deep roar American muscle holly hell loud. Cops are cool in my area. So db aint an issue.
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Old Dec 14, 2015 | 05:01 PM
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Originally Posted by TexomaMan_X2
Sounds legit man. I want no drone inside car but loud. not ear cracking rasp loud but deep roar American muscle holly hell loud. Cops are cool in my area. So db aint an issue.
Go with dynomax bullets or SLP LM2 reasonator then. Moroso spiral flows are the quietest bullet I could find.

dynomax bullets are loud as ****. I think you'd like that duals setup
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Old Dec 14, 2015 | 05:22 PM
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Indeed! ill check into the dynomax bullets. Thanks bub
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