High flow catalytic converter

[crownvic31]

I'd try to keep it as relevant to the OEM setup as possible. This includes the location of the cat, itself. The cat can't be too far downstream or it won't get hot enough to properly catalyze the exhaust and it'll soot up and clog.

Im thinking to copy this set up which is for a yukon.

 

[crownvic31]

Forgot to post the pic of the cat haha

Part #?

 

[992dr]

Part #?

That was a Magnaflow 59956 2.5" spun metallic cat
Here's a link for tall the specs. https://www.amazon.com/MagnaFlow-59956-Universal-Catalytic-Converter/dp/B000VX96IS

 

[Charlie207]

Im thinking to copy this set up which is for a yukon.
View attachment 404436

Got a link for this? Is it a GMT900 Yukon?

The only other LT header setup I've seen with (functional) cats is the American Racing system.

 

[992dr]

Got a link for this? Is it a GMT900 Yukon?

The only other LT header setup I've seen with (functional) cats is the American Racing system.

The ones pictured are for a 14-18 Silverado

Stainless Works and Kooks has them as well.

 

[Foggy]

I have the Kooks headers and cat system.... It's not available anymore..
IDK if it's discontinued or replaced with other part #'s... It fits very
well and I really like it. It was all SS and then I had it ceramic coated to keep the
heat at bay ! It's still hooked up to my OE exhaust. I have a magnaflow system,
but the oe is pretty loud now with the cam

 

[992dr]

I love Kooks, very nice and well made. Had them on my Fo-- well, you know what I mean.

@Charlie207

I had Thorley Tri-Ys on my previous 2dr and loved them, with the Maggy cats the it sounded incredible. Can't seem to find them for our application though.

Stainless works has a nice set https://stainlessworks.net/headers-2007-tahoe/

Check through Texas Speed and see if you can find something compatible https://www.texas-speed.com/c-3288-headers-xy-pipes_chevrolet-tahoe.aspx

 

[CMoore711]

@crownvic31 Whatever came of this?

Did you purchase some cats and have them welded into your Texas Speed off road Y pipe?
If so; Which cats did you use and how did it turn out? Any pictures of the final Y-Pipe?

 

[crownvic31]

@crownvic31 Whatever came of this?

Did you purchase some cats and have them welded into your Texas Speed off road Y pipe?
If so; Which cats did you use and how did it turn out? Any pictures of the final Y-Pipe?

Ok so i did get this installed and boy what a pain. Just like @992dr said, these are for a silverado and yes they are. So the 1st issue we ran into with the headers was that the collecter on the driver side header was contacting the floor of the escalade. So we had to tweak some to make it work.

2nd issue was on the transmission crossmember. We had to cut a nice chunk off of it for the pipe to run through and connect to flex pipe. Had to modified the y pipe to make it work. Luckly this guy is a buddy of mine and hooked me up but its not worth the hassle. Guy that sold me these told me he had it on his escalade which obviously there was no way.

As per cats, i bought 2 of these

https://www.amazon.com/MagnaFlow-54959-Universal-Catalytic-Converter/dp/B000XQQPFA/ref=mp_s_a_1_1?adgrpid=141780745891&hvadid=595151523743&hvdev=m&hvlocphy=9003503&hvnetw=g&hvqmt=e&hvrand=18313236884044698263&hvtargid=kwd-307734645578&hydadcr=27968_10171191&keywords=54959&qid=1696645119&sr=8-1

I beleive i got them off summitracing. They are alittle to big for my liking so that was another hassle to make these work.

Here are some pics.

 

[crownvic31]

One of the cats seats right under the trans pan. The o2 bung was welded right after it. I do have the check engine light due to the positioning of the o2 sensor. I also have a blackbear device whicb i am waiting to fix something before doing the tune.

My suggestion is to buy what fits. Modifying is ok if you have the skills or friends that wont charge you an arm and a leg but this wasnt easy. Does look good though .

 

[Tonyrodz]

Good to see you finally got them installed. If you do alot of short drives that flex pipe will rot pretty quick.
Will the cat being so close to the trans pan cause any fluid temperature (atf) issues? Gonna relocate that o2 bung? At least you're emissions legal now. How's it sound?

 

[CMoore711]

@crownvic31 Thanks for posting an update on your install and experience with pics. This information is valuable.

Your experience with how much of a PITA it was is exactly what I was afraid of.

I’ve installed kooks headers on previous vehicles; They fit, install as they should, and had zero issues for 100K+ miles.

Bit as you know there is a significant price difference between the headers from Kooks, ARH, & Stainless Works than some of the Speed Engineering and Texas Speed options. It’s just none of the cheaper options offer catted Y pipes.

 

[crownvic31]

@crownvic31 Thanks for posting an update on your install and experience with pics. This information is valuable.

Your experience with how much of a PITA it was is exactly what I was afraid of.

I’ve installed kooks headers on previous vehicles; They fit, install as they should, and had zero issues for 100K+ miles.

Bit as you know there is a significant price difference between the headers from Kooks, ARH, & Stainless Works than some of the Speed Engineering and Texas Speed options. It’s just none of the cheaper options offer catted Y pipes.

I just think that these headers were not for an escalade and its the reason why the guy sold them to me cheap.

Good to see you finally got them installed. If you do alot of short drives that flex pipe will rot pretty quick.
Will the cat being so close to the trans pan cause any fluid temperature (atf) issues? Gonna relocate that o2 bung? At least you're emissions legal now. How's it sound?

Why you say that about the flex pipe? My trans fluid temp in 90 degrees weather never went higher then 154. I also do have a tru cool cooler installed. The o2 rear will stay where it is. I will delete it with the tune if black bear cant adjust and make it work. Sounds pretty much the same as with the shorties i had. I guess the reall difference would had been with out cats? It does pull harder. Cant wait for tune

 

[Tonyrodz]

I just think that these headers were not for an escalade and its the reason why the guy sold them to me cheap.



Why you say that about the flex pipe? My trans fluid temp in 90 degrees weather never went higher then 154. I also do have a tru cool cooler installed. The o2 rear will stay where it is. I will delete it with the tune if black bear cant adjust and make it work. Sounds pretty much the same as with the shorties i had. I guess the reall difference would had been with out cats? It does pull harder. Cant wait for tune

Personally I've had bad experiences with flex pipe. If you do short drives condensation collects in the grooves of the pipe and rots it out pretty quickly.

 

[992dr]

Ok so i did get this installed and boy what a pain. Just like @992dr said, these are for a silverado and yes they are. So the 1st issue we ran into with the headers was that the collecter on the driver side header was contacting the floor of the escalade. So we had to tweak some to make it work.

2nd issue was on the transmission crossmember. We had to cut a nice chunk off of it for the pipe to run through and connect to flex pipe. Had to modified the y pipe to make it work. Luckly this guy is a buddy of mine and hooked me up but its not worth the hassle. Guy that sold me these told me he had it on his escalade which obviously there was no way.

As per cats, i bought 2 of these

https://www.amazon.com/MagnaFlow-54959-Universal-Catalytic-Converter/dp/B000XQQPFA/ref=mp_s_a_1_1?adgrpid=141780745891&hvadid=595151523743&hvdev=m&hvlocphy=9003503&hvnetw=g&hvqmt=e&hvrand=18313236884044698263&hvtargid=kwd-307734645578&hydadcr=27968_10171191&keywords=54959&qid=1696645119&sr=8-1

I beleive i got them off summitracing. They are alittle to big for my liking so that was another hassle to make these work.

Here are some pics.
View attachment 410809View attachment 410810View attachment 410811View attachment 410812

It really turned out great. You need to post a sound clip, must sound awesome.
Maybe one day down the road I'll get some LT but like mentioned it would have to be modified to accept cats which would not be a problem compared to making the new factory Y I'm in the process of making now.