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post #1 of 23 (permalink) Old 05-29-2014, 08:49 PM Thread Starter
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What to do with 3rd cat

I've decided on the catback I want to buy, and I want to do something about that 3rd cat. Is this y-pipe a bolt-on replacement?
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post #2 of 23 (permalink) Old 05-29-2014, 09:20 PM
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Definitely not a bolt on. The factory third cat is 2" to 2.25" and the pipes going to it go into it diagonally, not straight, so some fabrication will be required

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post #3 of 23 (permalink) Old 05-30-2014, 07:18 PM
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Just buy the manga flow kit it is complete bolt on. That's what I did
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post #4 of 23 (permalink) Old 05-30-2014, 11:46 PM Thread Starter
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Does that Magnaflow kit include the y pipe or is it just the back half?
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post #5 of 23 (permalink) Old 05-31-2014, 09:24 PM
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magnaflow only makes a direct fit cat assembly. The only big name cat back exhaust is from dynomax.

http://www.magnaflow.com/02catalytic...irectfit=23343

Ive always wondered if it flows any better than the stock assembly.

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post #6 of 23 (permalink) Old 05-31-2014, 09:58 PM
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cut it off, go true dual with a Magnaflow Tru-x and the mufflers (or not) of your choice...did that on a 95 I had, did that on my new F150.

Or go single 3 inch on your bird, that's a mean as hell sound, really, really, really nice.

Just weird and takes some getting used to.

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post #7 of 23 (permalink) Old 05-31-2014, 10:34 PM Thread Starter
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cut it off, go true dual with a Magnaflow Tru-x and the mufflers (or not) of your choice...did that on a 95 I had, did that on my new F150.

Or go single 3 inch on your bird, that's a mean as hell sound, really, really, really nice.

Just weird and takes some getting used to.
Will the Magnaflow x bolt up behind the stock downpipe assembly? I guess I could get that and buy the back half from Mandrel Trubends.
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post #8 of 23 (permalink) Old 06-01-2014, 09:53 AM
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no, nothing is going to bolt right up. The true dual system from MES fits nicely but its up to you to figure out how to connect it to the rest of the exhaust. They used to make downpipes but they have been discontinued.

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post #9 of 23 (permalink) Old 06-01-2014, 07:31 PM
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Originally Posted by mustang46kid View Post
Does that Magnaflow kit include the y pipe or is it just the back half?
I bought the magnflow kit for the front and a flowmaster cat back system for the back. It's complete bolt in. I did it in my condo parking lot with a jack and hand tools. Big difference over stock and sounds great
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post #10 of 23 (permalink) Old 06-02-2014, 07:09 AM
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But both of those kits have been discontinued for a while.

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post #11 of 23 (permalink) Old 06-02-2014, 08:14 AM Thread Starter
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Well I guess the only option left is to cut the stock mufflers and weld in some Flowmasters, short of spending $700 on the SCP true dual kit.
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post #12 of 23 (permalink) Old 06-02-2014, 03:18 PM
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The mandrel exhaust systems true dual kit can be had for under 300 dollars in 2.5in stainless. But it does not include mufflers, and it will need a little bit of custom work to install it.

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post #13 of 23 (permalink) Old 06-11-2014, 08:27 AM
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When you say custom work to the mandrel kit; how in depth can you explain the custom fitting? I just ordered the mandrel pipes for my '94, and I bet a turttle with down syndrome could weld better than me.
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post #14 of 23 (permalink) Old 06-11-2014, 10:56 AM Thread Starter
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From what I read, the back half of the mandrel kit is more or less a bolt-on installation - you just have to weld on some mufflers.
The front half however, requires twisting the passenger side cat and welding on a new 02 sensor bung. I guess you won't have this problem if you get the catless kit but that still requires a section of pipe welded on where the cats would go.
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post #15 of 23 (permalink) Old 06-11-2014, 01:54 PM
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That doesn't sound as terrible as I was expecting. Cheap enough to be acceptable.
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post #16 of 23 (permalink) Old 06-11-2014, 08:58 PM
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Quote:
Originally Posted by ricklovin93 View Post
The mandrel exhaust systems true dual kit can be had for under 300 dollars in 2.5in stainless. But it does not include mufflers, and it will need a little bit of custom work to install it.
got a link
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post #17 of 23 (permalink) Old 06-11-2014, 09:17 PM
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http://www.mandrelexhaustsystems.com...-TUBING/Detail

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post #18 of 23 (permalink) Old 06-12-2014, 04:34 AM
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Lop it off, put an X-pipe behind it, with a pair of SLP Loudmouth 1's after, and then run dual pipes out to the back....

Just like me!!

http://youtu.be/CHIbXdX064c

1997 Laser Red Thunderbird LX V8, grey cloth, third cat replaced with X-pipe, SLP Loudmouth 1's, 2.25" duals, (loud as all hell)
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post #19 of 23 (permalink) Old 06-17-2014, 09:18 AM Thread Starter
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Originally Posted by Blade Runner View Post
Lop it off, put an X-pipe behind it, with a pair of SLP Loudmouth 1's after, and then run dual pipes out to the back....

Just like me!!

http://youtu.be/CHIbXdX064c
Any pictures of this setup?
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post #20 of 23 (permalink) Old 06-18-2014, 07:00 PM
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Any pictures of this setup?
http://forums.tccoa.com/showthread.p...ht=SLP+exhaust

1997 Laser Red Thunderbird LX V8, grey cloth, third cat replaced with X-pipe, SLP Loudmouth 1's, 2.25" duals, (loud as all hell)
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post #21 of 23 (permalink) Old 06-19-2014, 12:32 PM Thread Starter
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Very nice. I take it you did some cutting/welding to get that x pipe to fit?
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post #22 of 23 (permalink) Old 06-21-2014, 03:47 AM
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Very nice. I take it you did some cutting/welding to get that x pipe to fit?
Nah. The exhaust guy that I used gets bored and makes his own x pipes. He found one that fit, and there she be.

1997 Laser Red Thunderbird LX V8, grey cloth, third cat replaced with X-pipe, SLP Loudmouth 1's, 2.25" duals, (loud as all hell)
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post #23 of 23 (permalink) Old 07-19-2014, 04:50 PM
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I'm having this same issue on my car, 93 with the 5.0.... What I thought was a resonator is actually a 3rd cat (the last 93 Tbird I had had the resonator, so when I glanced under the car before and saw a box that's what I figured it was) so I want to at least take that 3rd cat out of the exhaust. Can I get a y-pipe to fit that diagonal angle to just straight pipe that section?
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